Received-SPF: pass (google.com: domain of linux-kernel+bounces-6430-linux.lists.archive=gmail.com@vger.kernel.org designates 2604:1380:45e3:2400::1 as permitted sender) client-ip=2604:1380:45e3:2400::1;
Precedence: bulk
MIME-Version: 1.0
References: <20231208061407.2125867-1-yuzhao@google.com> <CAMgjq7BTaV5OvHNjGRVJP2VDxj+PXhfd6957CjS4BJ9J4OY8HA@mail.gmail.com>
 <CAOUHufYwZAUaJh6i8Fazc4gVMSqcsz9JbRNpj0cpx2qR+bZBFw@mail.gmail.com>
 <CAMgjq7AtceR-CXnKFfQHM3qi0y4oGyJ4_sw_uh5EkpXCBzkCXg@mail.gmail.com>
 <CAMgjq7CJ3hYHysyRfHzYU4hOYqhUOttxMYGtg0FxzM_wvvyhFA@mail.gmail.com>
 <CAOUHufa=ybd-EPos9DryLHYyhphN0P7qyV5NY3Pui0dfVSk9tQ@mail.gmail.com>
 <ZXpx0K8Vdo3FJixg@google.com> <CAMgjq7CRf4iEKuW2qWKzbhssMbixBo3UoLPqsSk4b+Tvw8at8A@mail.gmail.com>
 <CAOUHufY6x_Erz02Bzoejfs_g2hcmrMFpiOdjiaWZ97oirz71aQ@mail.gmail.com>
 <ZXvcgyjTu92Qqk5X@google.com> <CAMgjq7BsY1tJeOZwSppxUN7Lha-_a7WLfhv1_bxTuU4EuiQyVg@mail.gmail.com>
 <CAOUHufZFkdDjCdQKBV5+W_bp_7x5VwrwkYbJeDdQ19S=m4Mc6A@mail.gmail.com>
 <CAOUHufbRq8WsGzNRn119GqL5AmeSOkZxQv3L2LTaCm=k3bzrRA@mail.gmail.com> <CAMgjq7C8uUOz5i8rEHNCs37fdEiAuMZsuV+Ktnz3TMX9Nf8F+g@mail.gmail.com>
In-Reply-To: <CAMgjq7C8uUOz5i8rEHNCs37fdEiAuMZsuV+Ktnz3TMX9Nf8F+g@mail.gmail.com>
From: Yu Zhao <yuzhao@google.com>
Date: Tue, 19 Dec 2023 23:38:31 -0700
Message-ID: <CAOUHufamzdOL8ByV9V7KQJKnvZBMboVz-EGD=Fus7LZk1inhCw@mail.gmail.com>
Subject: Re: [PATCH mm-unstable v1 1/4] mm/mglru: fix underprotected page cache
To: Kairui Song <ryncsn@gmail.com>
Cc: Andrew Morton <akpm@linux-foundation.org>, linux-mm@kvack.org, 
	linux-kernel@vger.kernel.org, Charan Teja Kalla <quic_charante@quicinc.com>, 
	Kalesh Singh <kaleshsingh@google.com>, stable@vger.kernel.org
Content-Type: text/plain; charset="UTF-8"
Content-Transfer-Encoding: quoted-printable

On Tue, Dec 19, 2023 at 11:58=E2=80=AFAM Kairui Song <ryncsn@gmail.com> wro=
te:
>
> Yu Zhao <yuzhao@google.com> =E4=BA=8E2023=E5=B9=B412=E6=9C=8819=E6=97=A5=
=E5=91=A8=E4=BA=8C 11:45=E5=86=99=E9=81=93=EF=BC=9A
> >
> > On Mon, Dec 18, 2023 at 8:21=E2=80=AFPM Yu Zhao <yuzhao@google.com> wro=
te:
> > >
> > > On Mon, Dec 18, 2023 at 11:05=E2=80=AFAM Kairui Song <ryncsn@gmail.co=
m> wrote:
> > > >
> > > > Yu Zhao <yuzhao@google.com> =E4=BA=8E2023=E5=B9=B412=E6=9C=8815=E6=
=97=A5=E5=91=A8=E4=BA=94 12:56=E5=86=99=E9=81=93=EF=BC=9A
> > > > >
> > > > > On Thu, Dec 14, 2023 at 04:51:00PM -0700, Yu Zhao wrote:
> > > > > > On Thu, Dec 14, 2023 at 11:38=E2=80=AFAM Kairui Song <ryncsn@gm=
ail.com> wrote:
> > > > > > >
> > > > > > > Yu Zhao <yuzhao@google.com> =E4=BA=8E2023=E5=B9=B412=E6=9C=88=
14=E6=97=A5=E5=91=A8=E5=9B=9B 11:09=E5=86=99=E9=81=93=EF=BC=9A
> > > > > > > > On Wed, Dec 13, 2023 at 12:59:14AM -0700, Yu Zhao wrote:
> > > > > > > > > On Tue, Dec 12, 2023 at 8:03=E2=80=AFPM Kairui Song <rync=
sn@gmail.com> wrote:
> > > > > > > > > >
> > > > > > > > > > Kairui Song <ryncsn@gmail.com> =E4=BA=8E2023=E5=B9=B412=
=E6=9C=8812=E6=97=A5=E5=91=A8=E4=BA=8C 14:52=E5=86=99=E9=81=93=EF=BC=9A
> > > > > > > > > > >
> > > > > > > > > > > Yu Zhao <yuzhao@google.com> =E4=BA=8E2023=E5=B9=B412=
=E6=9C=8812=E6=97=A5=E5=91=A8=E4=BA=8C 06:07=E5=86=99=E9=81=93=EF=BC=9A
> > > > > > > > > > > >
> > > > > > > > > > > > On Fri, Dec 8, 2023 at 1:24=E2=80=AFAM Kairui Song =
<ryncsn@gmail.com> wrote:
> > > > > > > > > > > > >
> > > > > > > > > > > > > Yu Zhao <yuzhao@google.com> =E4=BA=8E2023=E5=B9=
=B412=E6=9C=888=E6=97=A5=E5=91=A8=E4=BA=94 14:14=E5=86=99=E9=81=93=EF=BC=9A
> > > > > > > > > > > > > >
> > > > > > > > > > > > > > Unmapped folios accessed through file descripto=
rs can be
> > > > > > > > > > > > > > underprotected. Those folios are added to the o=
ldest generation based
> > > > > > > > > > > > > > on:
> > > > > > > > > > > > > > 1. The fact that they are less costly to reclai=
m (no need to walk the
> > > > > > > > > > > > > >    rmap and flush the TLB) and have less impact=
 on performance (don't
> > > > > > > > > > > > > >    cause major PFs and can be non-blocking if n=
eeded again).
> > > > > > > > > > > > > > 2. The observation that they are likely to be s=
ingle-use. E.g., for
> > > > > > > > > > > > > >    client use cases like Android, its apps pars=
e configuration files
> > > > > > > > > > > > > >    and store the data in heap (anon); for serve=
r use cases like MySQL,
> > > > > > > > > > > > > >    it reads from InnoDB files and holds the cac=
hed data for tables in
> > > > > > > > > > > > > >    buffer pools (anon).
> > > > > > > > > > > > > >
> > > > > > > > > > > > > > However, the oldest generation can be very shor=
t lived, and if so, it
> > > > > > > > > > > > > > doesn't provide the PID controller with enough =
time to respond to a
> > > > > > > > > > > > > > surge of refaults. (Note that the PID controlle=
r uses weighted
> > > > > > > > > > > > > > refaults and those from evicted generations onl=
y take a half of the
> > > > > > > > > > > > > > whole weight.) In other words, for a short live=
d generation, the
> > > > > > > > > > > > > > moving average smooths out the spike quickly.
> > > > > > > > > > > > > >
> > > > > > > > > > > > > > To fix the problem:
> > > > > > > > > > > > > > 1. For folios that are already on LRU, if they =
can be beyond the
> > > > > > > > > > > > > >    tracking range of tiers, i.e., five accesses=
 through file
> > > > > > > > > > > > > >    descriptors, move them to the second oldest =
generation to give them
> > > > > > > > > > > > > >    more time to age. (Note that tiers are used =
by the PID controller
> > > > > > > > > > > > > >    to statistically determine whether folios ac=
cessed multiple times
> > > > > > > > > > > > > >    through file descriptors are worth protectin=
g.)
> > > > > > > > > > > > > > 2. When adding unmapped folios to LRU, adjust t=
he placement of them so
> > > > > > > > > > > > > >    that they are not too close to the tail. The=
 effect of this is
> > > > > > > > > > > > > >    similar to the above.
> > > > > > > > > > > > > >
> > > > > > > > > > > > > > On Android, launching 55 apps sequentially:
> > > > > > > > > > > > > >                            Before     After    =
  Change
> > > > > > > > > > > > > >   workingset_refault_anon  25641024   25598972 =
  0%
> > > > > > > > > > > > > >   workingset_refault_file  115016834  106178438=
  -8%
> > > > > > > > > > > > >
> > > > > > > > > > > > > Hi Yu,
> > > > > > > > > > > > >
> > > > > > > > > > > > > Thanks you for your amazing works on MGLRU.
> > > > > > > > > > > > >
> > > > > > > > > > > > > I believe this is the similar issue I was trying =
to resolve previously:
> > > > > > > > > > > > > https://lwn.net/Articles/945266/
> > > > > > > > > > > > > The idea is to use refault distance to decide if =
the page should be
> > > > > > > > > > > > > place in oldest generation or some other gen, whi=
ch per my test,
> > > > > > > > > > > > > worked very well, and we have been using refault =
distance for MGLRU in
> > > > > > > > > > > > > multiple workloads.
> > > > > > > > > > > > >
> > > > > > > > > > > > > There are a few issues left in my previous RFC se=
ries, like anon pages
> > > > > > > > > > > > > in MGLRU shouldn't be considered, I wanted to col=
lect feedback or test
> > > > > > > > > > > > > cases, but unfortunately it seems didn't get too =
much attention
> > > > > > > > > > > > > upstream.
> > > > > > > > > > > > >
> > > > > > > > > > > > > I think both this patch and my previous series ar=
e for solving the
> > > > > > > > > > > > > file pages underpertected issue, and I did a quic=
k test using this
> > > > > > > > > > > > > series, for mongodb test, refault distance seems =
still a better
> > > > > > > > > > > > > solution (I'm not saying these two optimization a=
re mutually exclusive
> > > > > > > > > > > > > though, just they do have some conflicts in imple=
mentation and solving
> > > > > > > > > > > > > similar problem):
> > > > > > > > > > > > >
> > > > > > > > > > > > > Previous result:
> > > > > > > > > > > > > =3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=
=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=
=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D
> > > > > > > > > > > > > Execution Results after 905 seconds
> > > > > > > > > > > > > -------------------------------------------------=
-----------------
> > > > > > > > > > > > >                   Executed        Time (=C2=B5s) =
      Rate
> > > > > > > > > > > > >   STOCK_LEVEL     2542            27121571486.2  =
 0.09 txn/s
> > > > > > > > > > > > > -------------------------------------------------=
-----------------
> > > > > > > > > > > > >   TOTAL           2542            27121571486.2  =
 0.09 txn/s
> > > > > > > > > > > > >
> > > > > > > > > > > > > This patch:
> > > > > > > > > > > > > =3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=
=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=
=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D
> > > > > > > > > > > > > Execution Results after 900 seconds
> > > > > > > > > > > > > -------------------------------------------------=
-----------------
> > > > > > > > > > > > >                   Executed        Time (=C2=B5s) =
      Rate
> > > > > > > > > > > > >   STOCK_LEVEL     1594            27061522574.4  =
 0.06 txn/s
> > > > > > > > > > > > > -------------------------------------------------=
-----------------
> > > > > > > > > > > > >   TOTAL           1594            27061522574.4  =
 0.06 txn/s
> > > > > > > > > > > > >
> > > > > > > > > > > > > Unpatched version is always around ~500.
> > > > > > > > > > > >
> > > > > > > > > > > > Thanks for the test results!
> > > > > > > > > > > >
> > > > > > > > > > > > > I think there are a few points here:
> > > > > > > > > > > > > - Refault distance make use of page shadow so it =
can better
> > > > > > > > > > > > > distinguish evicted pages of different access pat=
tern (re-access
> > > > > > > > > > > > > distance).
> > > > > > > > > > > > > - Throttled refault distance can help hold part o=
f workingset when
> > > > > > > > > > > > > memory is too small to hold the whole workingset.
> > > > > > > > > > > > >
> > > > > > > > > > > > > So maybe part of this patch and the bits of previ=
ous series can be
> > > > > > > > > > > > > combined to work better on this issue, how do you=
 think?
> > > > > > > > > > > >
> > > > > > > > > > > > I'll try to find some time this week to look at you=
r RFC. It'd be a
> > > > > > > > > >
> > > > > > > > > > Hi Yu,
> > > > > > > > > >
> > > > > > > > > > I'm working on V4 of the RFC now, which just update som=
e comments, and
> > > > > > > > > > skip anon page re-activation in refault path for mglru =
which was not
> > > > > > > > > > very helpful, only some tiny adjustment.
> > > > > > > > > > And I found it easier to test with fio, using following=
 test script:
> > > > > > > > > >
> > > > > > > > > > #!/bin/bash
> > > > > > > > > > swapoff -a
> > > > > > > > > >
> > > > > > > > > > modprobe brd rd_nr=3D1 rd_size=3D16777216
> > > > > > > > > > mkfs.ext4 /dev/ram0
> > > > > > > > > > mount /dev/ram0 /mnt
> > > > > > > > > >
> > > > > > > > > > mkdir -p /sys/fs/cgroup/benchmark
> > > > > > > > > > cd /sys/fs/cgroup/benchmark
> > > > > > > > > >
> > > > > > > > > > echo 4G > memory.max
> > > > > > > > > > echo $$ > cgroup.procs
> > > > > > > > > > echo 3 > /proc/sys/vm/drop_caches
> > > > > > > > > >
> > > > > > > > > > fio -name=3Dmglru --numjobs=3D12 --directory=3D/mnt --s=
ize=3D1024m \
> > > > > > > > > >           --buffered=3D1 --ioengine=3Dio_uring --iodept=
h=3D128 \
> > > > > > > > > >           --iodepth_batch_submit=3D32 --iodepth_batch_c=
omplete=3D32 \
> > > > > > > > > >           --rw=3Drandread --random_distribution=3Dzipf:=
0.5 --norandommap \
> > > > > > > > > >           --time_based --ramp_time=3D5m --runtime=3D5m =
--group_reporting
> > > > > > > > > >
> > > > > > > > > > zipf:0.5 is used here to simulate a cached read with sl=
ight bias
> > > > > > > > > > towards certain pages.
> > > > > > > > > > Unpatched 6.7-rc4:
> > > > > > > > > > Run status group 0 (all jobs):
> > > > > > > > > >    READ: bw=3D6548MiB/s (6866MB/s), 6548MiB/s-6548MiB/s
> > > > > > > > > > (6866MB/s-6866MB/s), io=3D1918GiB (2060GB), run=3D30000=
1-300001msec
> > > > > > > > > >
> > > > > > > > > > Patched with RFC v4:
> > > > > > > > > > Run status group 0 (all jobs):
> > > > > > > > > >    READ: bw=3D7270MiB/s (7623MB/s), 7270MiB/s-7270MiB/s
> > > > > > > > > > (7623MB/s-7623MB/s), io=3D2130GiB (2287GB), run=3D30000=
1-300001msec
> > > > > > > > > >
> > > > > > > > > > Patched with this series:
> > > > > > > > > > Run status group 0 (all jobs):
> > > > > > > > > >    READ: bw=3D7098MiB/s (7442MB/s), 7098MiB/s-7098MiB/s
> > > > > > > > > > (7442MB/s-7442MB/s), io=3D2079GiB (2233GB), run=3D30000=
2-300002msec
> > > > > > > > > >
> > > > > > > > > > MGLRU off:
> > > > > > > > > > Run status group 0 (all jobs):
> > > > > > > > > >    READ: bw=3D6525MiB/s (6842MB/s), 6525MiB/s-6525MiB/s
> > > > > > > > > > (6842MB/s-6842MB/s), io=3D1912GiB (2052GB), run=3D30000=
2-300002msec
> > > > > > > > > >
> > > > > > > > > > - If I change zipf:0.5 to random:
> > > > > > > > > > Unpatched 6.7-rc4:
> > > > > > > > > > Patched with this series:
> > > > > > > > > > Run status group 0 (all jobs):
> > > > > > > > > >    READ: bw=3D5975MiB/s (6265MB/s), 5975MiB/s-5975MiB/s
> > > > > > > > > > (6265MB/s-6265MB/s), io=3D1750GiB (1879GB), run=3D30000=
2-300002msec
> > > > > > > > > >
> > > > > > > > > > Patched with RFC v4:
> > > > > > > > > > Run status group 0 (all jobs):
> > > > > > > > > >    READ: bw=3D5987MiB/s (6278MB/s), 5987MiB/s-5987MiB/s
> > > > > > > > > > (6278MB/s-6278MB/s), io=3D1754GiB (1883GB), run=3D30000=
1-300001msec
> > > > > > > > > >
> > > > > > > > > > Patched with this series:
> > > > > > > > > > Run status group 0 (all jobs):
> > > > > > > > > >    READ: bw=3D5839MiB/s (6123MB/s), 5839MiB/s-5839MiB/s
> > > > > > > > > > (6123MB/s-6123MB/s), io=3D1711GiB (1837GB), run=3D30000=
1-300001msec
> > > > > > > > > >
> > > > > > > > > > MGLRU off:
> > > > > > > > > > Run status group 0 (all jobs):
> > > > > > > > > >    READ: bw=3D5689MiB/s (5965MB/s), 5689MiB/s-5689MiB/s
> > > > > > > > > > (5965MB/s-5965MB/s), io=3D1667GiB (1790GB), run=3D30000=
3-300003msec
> > > > > > > > > >
> > > > > > > > > > fio uses ramdisk so LRU accuracy will have smaller impa=
ct. The Mongodb
> > > > > > > > > > test I provided before uses a SATA SSD so it will have =
a much higher
> > > > > > > > > > impact. I'll provides a script to setup the test case a=
nd run it, it's
> > > > > > > > > > more complex to setup than fio since involving setting =
up multiple
> > > > > > > > > > replicas and auth and hundreds of GB of test fixtures, =
I'm currently
> > > > > > > > > > occupied by some other tasks but will try best to send =
them out as
> > > > > > > > > > soon as possible.
> > > > > > > > >
> > > > > > > > > Thanks! Apparently your RFC did show better IOPS with bot=
h access
> > > > > > > > > patterns, which was a surprise to me because it had highe=
r refaults
> > > > > > > > > and usually higher refautls result in worse performance.
> > > > >
> > > > > And thanks for providing the refaults I requested for -- your dat=
a
> > > > > below confirms what I mentioned above:
> > > > >
> > > > > For fio:
> > > > >                            Your RFC   This series   Change
> > > > >   workingset_refault_file  628192729  596790506     -5%
> > > > >   IOPS                     1862k      1830k         -2%
> > > > >
> > > > > For MongoDB:
> > > > >                            Your RFC   This series   Change
> > > > >   workingset_refault_anon  10512      35277         +30%
> > > > >   workingset_refault_file  22751782   20335355      -11%
> > > > >   total                    22762294   20370632      -11%
> > > > >   TPS                      0.09       0.06          -33%
> > > > >
> > > > > For MongoDB, this series should be a big win (but apparently it's=
 not),
> > > > > especially when using zram, since an anon refault should be a lot
> > > > > cheaper than a file refault.
> > > > >
> > > > > So, I'm baffled...
> > > > >
> > > > > One important detail I forgot to mention: based on your data from
> > > > > lru_gen_full, I think there is another difference between our Kco=
nfigs:
> > > > >
> > > > >                   Your Kconfig  My Kconfig  Max possible
> > > > >   LRU_REFS_WIDTH  1             2           2
> > > >
> > > > Hi Yu,
> > > >
> > > > Thanks for the info, my fault, I forgot to update my config as I wa=
s
> > > > testing some other features.
> > > > Buf after I changed LRU_REFS_WIDTH to 2 by disabling IDLE_PAGE, thi=
ng
> > > > got much worse for MongoDB test:
> > > >
> > > > With LRU_REFS_WIDTH =3D=3D 2:
> > > >
> > > > This patch:
> > > > =3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=
=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=
=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D
> > > > Execution Results after 919 seconds
> > > > ------------------------------------------------------------------
> > > >                   Executed        Time (=C2=B5s)       Rate
> > > >   STOCK_LEVEL     488             27598136201.9   0.02 txn/s
> > > > ------------------------------------------------------------------
> > > >   TOTAL           488             27598136201.9   0.02 txn/s
> > > >
> > > > memcg    86 /system.slice/docker-1c3a90be9f0a072f5719332419550cd0e1=
455f2cd5863bc2780ca4d3f913ece5.scope
> > > >  node     0
> > > >           1     948187          0x          0x
> > > >                      0          0           0           0          =
 0
> > > >          0           0=C2=B7
> > > >                      1          0           0           0          =
 0
> > > >          0           0=C2=B7
> > > >                      2          0           0           0          =
 0
> > > >          0           0=C2=B7
> > > >                      3          0           0           0          =
 0
> > > >          0           0=C2=B7
> > > >                                 0           0           0          =
 0
> > > >          0           0=C2=B7
> > > >           2     948187          0     6051788=C2=B7
> > > >                      0          0r          0e          0p      119=
16r
> > > >      66442e          0p
> > > >                      1          0r          0e          0p        9=
03r
> > > >      16888e          0p
> > > >                      2          0r          0e          0p        4=
59r
> > > >       9764e          0p
> > > >                      3          0r          0e          0p         =
 0r
> > > >          0e       2874p
> > > >                                 0           0           0          =
 0
> > > >          0           0=C2=B7
> > > >           3     948187    1353160        6351=C2=B7
> > > >                      0          0           0           0          =
 0
> > > >          0           0=C2=B7
> > > >                      1          0           0           0          =
 0
> > > >          0           0=C2=B7
> > > >                      2          0           0           0          =
 0
> > > >          0           0=C2=B7
> > > >                      3          0           0           0          =
 0
> > > >          0           0=C2=B7
> > > >                                 0           0           0          =
 0
> > > >          0           0=C2=B7
> > > >           4      73045      23573          12=C2=B7
> > > >                      0          0R          0T          0     34986=
07R
> > > >    4868605T          0=C2=B7
> > > >                      1          0R          0T          0     30122=
46R
> > > >    3270261T          0=C2=B7
> > > >                      2          0R          0T          0     24986=
08R
> > > >    2839104T          0=C2=B7
> > > >                      3          0R          0T          0          =
 0R
> > > >    1983947T          0=C2=B7
> > > >                           1486579L          0O    1380614Y       29=
45N
> > > >       2945F       2734A
> > > >
> > > > workingset_refault_anon 0
> > > > workingset_refault_file 18130598
> > > >
> > > >               total        used        free      shared  buff/cache=
   available
> > > > Mem:          31978        6705         312          20       24960=
       24786
> > > > Swap:         31977           4       31973
> > > >
> > > > RFC:
> > > > =3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=
=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=
=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D
> > > > Execution Results after 908 seconds
> > > > ------------------------------------------------------------------
> > > >                   Executed        Time (=C2=B5s)       Rate
> > > >   STOCK_LEVEL     2252            27159962888.2   0.08 txn/s
> > > > ------------------------------------------------------------------
> > > >   TOTAL           2252            27159962888.2   0.08 txn/s
> > > >
> > > > workingset_refault_anon 22585
> > > > workingset_refault_file 22715256
> > > >
> > > > memcg    66 /system.slice/docker-0989446ff78106e32d3f400a0cf371c9a7=
03281bded86d6d6bb1af706ebb25da.scope
> > > >  node     0
> > > >          22     563007       2274     1198225=C2=B7
> > > >                      0          0r          1e          0p         =
 0r
> > > >     697076e          0p
> > > >                      1          0r          0e          0p         =
 0r
> > > >          0e     325661p
> > > >                      2          0r          0e          0p         =
 0r
> > > >          0e     888728p
> > > >                      3          0r          0e          0p         =
 0r
> > > >          0e    3602238p
> > > >                                 0           0           0          =
 0
> > > >          0           0=C2=B7
> > > >          23     532222       7525     4948747=C2=B7
> > > >                      0          0           0           0          =
 0
> > > >          0           0=C2=B7
> > > >                      1          0           0           0          =
 0
> > > >          0           0=C2=B7
> > > >                      2          0           0           0          =
 0
> > > >          0           0=C2=B7
> > > >                      3          0           0           0          =
 0
> > > >          0           0=C2=B7
> > > >                                 0           0           0          =
 0
> > > >          0           0=C2=B7
> > > >          24     500367    1214667        3292=C2=B7
> > > >                      0          0           0           0          =
 0
> > > >          0           0=C2=B7
> > > >                      1          0           0           0          =
 0
> > > >          0           0=C2=B7
> > > >                      2          0           0           0          =
 0
> > > >          0           0=C2=B7
> > > >                      3          0           0           0          =
 0
> > > >          0           0=C2=B7
> > > >                                 0           0           0          =
 0
> > > >          0           0=C2=B7
> > > >          25     469692      40797         466=C2=B7
> > > >                      0          0R        271T          0          =
 0R
> > > >    1162165T          0=C2=B7
> > > >                      1          0R          0T          0      7740=
28R
> > > >    1205332T          0=C2=B7
> > > >                      2          0R          0T          0          =
 0R
> > > >     932484T          0=C2=B7
> > > >                      3          0R          1T          0          =
 0R
> > > >    4252158T          0=C2=B7
> > > >                          25178380L     156515O   23953602Y      592=
34N
> > > >      49391F      48664A
> > > >
> > > >               total        used        free      shared  buff/cache=
   available
> > > > Mem:          31978        6968         338           5       24671=
       24555
> > > > Swap:         31977        1533       30444
> > > >
> > > > Using same mongodb config (a 3 replica cluster using the same confi=
g):
> > > > {
> > > >     "net": {
> > > >         "bindIpAll": true,
> > > >         "ipv6": false,
> > > >         "maxIncomingConnections": 10000,
> > > >     },
> > > >     "setParameter": {
> > > >         "disabledSecureAllocatorDomains": "*"
> > > >     },
> > > >     "replication": {
> > > >         "oplogSizeMB": 10480,
> > > >         "replSetName": "issa-tpcc_0"
> > > >     },
> > > >     "security": {
> > > >         "keyFile": "/data/db/keyfile"
> > > >     },
> > > >     "storage": {
> > > >         "dbPath": "/data/db/",
> > > >         "syncPeriodSecs": 60,
> > > >         "directoryPerDB": true,
> > > >         "wiredTiger": {
> > > >             "engineConfig": {
> > > >                 "cacheSizeGB": 5
> > > >             }
> > > >         }
> > > >     },
> > > >     "systemLog": {
> > > >         "destination": "file",
> > > >         "logAppend": true,
> > > >         "logRotate": "rename",
> > > >         "path": "/data/db/mongod.log",
> > > >         "verbosity": 0
> > > >     }
> > > > }
> > > >
> > > > The test environment have 32g memory and 16 core.
> > > >
> > > > Per my analyze, the access pattern for the mongodb test is that pag=
e
> > > > will be re-access long after it's evicted so PID controller won't
> > > > protect higher tier. That RFC will make use of the long existing
> > > > shadow to do feedback to PID/Gen so the result will be much better.
> > > > Still need more adjusting though, will try to do a rebase on top of
> > > > mm-unstable which includes your patch.
> > > >
> > > > I've no idea why the workingset_refault_* is higher in the better
> > > > case, this a clearly an IO bound workload, Memory and IO is busy wh=
ile
> > > > CPU is not full...
> > > >
> > > > I've uploaded my local reproducer here:
> > > > https://github.com/ryncsn/emm-test-project/tree/master/mongo-cluste=
r
> > > > https://github.com/ryncsn/py-tpcc
> > >
> > > Thanks for the repos -- I'm trying them right now. Which MongoDB
> > > version did you use? setup.sh didn't seem to install it.
> > >
> > > Also do you have a QEMU image? It'd be a lot easier for me to
> > > duplicate the exact environment by looking into it.
> >
> > I ended up using docker.io/mongodb/mongodb-community-server:latest,
> > and it's not working:
> >
> > # docker exec -it mongo-r1 mongosh --eval \
> > '"rs.initiate({
> >     _id: "issa-tpcc_0",
> >     members: [
> >       {_id: 0, host: "mongo-r1"},
> >       {_id: 1, host: "mongo-r2"},
> >       {_id: 2, host: "mongo-r3"}
> >     ]
> > })"'
> > Emulate Docker CLI using podman. Create /etc/containers/nodocker to qui=
et msg.
> > Error: can only create exec sessions on running containers: container
> > state improper
>
> Hi Yu,
>
> I've updated the test repo:
> https://github.com/ryncsn/emm-test-project/tree/master/mongo-cluster
>
> I've tested it on top of latest Fedora Cloud Image 39 and it worked
> well for me, the README now contains detailed and not hard to follow
> steps to reproduce this test.

Thanks. I was following the instructions down to the letter and it
fell apart again at line 46 (./tpcc.py).

Were you able to successfully run the benchmark on a fresh VM by
following the instructions? If not, I'd appreciate it if you could do
so and document all the missing steps.