Does Intels C++ compiler for Linux works fine for compiling the Linux
kernel? It is not 100% compatible, as far as I know. Which advantages does
the Intel compiler brings compared to gcc? faster speed? Other things?
Thanks in advance
On Mon, Jan 20, 2003 at 04:48:55PM +0000, John Bradford wrote:
> > Does Intels C++ compiler for Linux works fine for compiling the Linux
> > kernel? It is not 100% compatible, as far as I know.
>
> I doubt it - Linux makes extensive use of GCC compiler extensions.
I doubt your doubting. It works.
Jeff
> Does Intels C++ compiler for Linux works fine for compiling the Linux
> kernel? It is not 100% compatible, as far as I know.
I doubt it - Linux makes extensive use of GCC compiler extensions.
> Which advantages does the Intel compiler brings compared to gcc?
> faster speed? Other things?
In theory it might be slightly faster, however GCC is a fairly good
compiler on i386 anyway.
John.
> > > Does Intels C++ compiler for Linux works fine for compiling the Linux
> > > kernel? It is not 100% compatible, as far as I know.
> >
> > I doubt it - Linux makes extensive use of GCC compiler extensions.
>
> I doubt your doubting. It works.
I'm suprised. Sorry once again for the mis-information, (heh, but at
least it was on-topic, which is somewhat amasing for this mailing list
:-) ). Is there a concious effort to make it compile the kernel, or
are they aiming for general GCC compliance?
John.
> In theory it might be slightly faster, however GCC is a fairly good
> compiler on i386 anyway.
Hmm, i've seen comparative tests with gcc3.2 and the latest intel c++
compiler. gcc had better results with most of the tests, but not all of
them.
I wish i could give a link without searching.
regards,
Maciej
> -----Original Message-----
> From: Jeff Garzik [mailto:[email protected]]
> Sent: Monday, January 20, 2003 8:54 AM
> To: John Bradford
> Cc: Henrik Andersen; [email protected]
> Subject: Re: Intel C++ compiler?
>
> On Mon, Jan 20, 2003 at 04:48:55PM +0000, John Bradford wrote:
> > > Does Intels C++ compiler for Linux works fine for compiling the Linux
> > > kernel? It is not 100% compatible, as far as I know.
> >
> > I doubt it - Linux makes extensive use of GCC compiler extensions.
>
> I doubt your doubting. It works.
>
> Jeff
>
That's true.
I posted this on Fri 10/25/2002:
============================================================================
The following are the lmbench results (P3 and P4P) we tried to get. The kernels built by gcc 3.2 were not stable for P4P, so we used an older version of gcc.
p70 -- the kernel built by just with the -O2 optimization (Intel compiler 7.0)
pgoipo -- P70 + PGO (profile-guided optimization) + IPO (interprocedural optimization)
inline -- pgoipo + forced inline
gcc32 -- gcc 3.2
gcc30 -- gcc 3.02
Jun Nakajima
-----Original Message-----
From: Andi Kleen [mailto:[email protected]]
Sent: Friday, October 18, 2002 7:29 PM
To: Nakajima, Jun
Cc: Andi Kleen; David S. Miller; [email protected];
[email protected]; Mallick, Asit K; Saxena, Sunil
Subject: Re: [PATCH] fixes for building kernel using Intel compiler
BTW do you have any benchmark / code size results to share with
Intel compiler vs gcc 3.2 ? How much does it give ?
-Andi
-------------------------------------------------------------------------
UP P3 ====================================================================
cd results && make summary percent 2>/dev/null | more
make[1]: Entering directory `/home/hd7/yu/LMbench/results'
L M B E N C H 2 . 0 S U M M A R Y
------------------------------------
Basic system parameters
----------------------------------------------------
Host OS Description Mhz
--------- ------------- ----------------------- ----
p70 Linux 2.4.18 i686-pc-linux-gnu 847
p70 Linux 2.4.18 i686-pc-linux-gnu 847
p70 Linux 2.4.18 i686-pc-linux-gnu 847
pgo Linux 2.4.18 i686-pc-linux-gnu 847
pgo Linux 2.4.18 i686-pc-linux-gnu 847
pgo Linux 2.4.18 i686-pc-linux-gnu 847
pgoipo Linux 2.4.18 i686-pc-linux-gnu 847
pgoipo Linux 2.4.18 i686-pc-linux-gnu 847
pgoipo Linux 2.4.18 i686-pc-linux-gnu 847
inline Linux 2.4.18 i686-pc-linux-gnu 847
inline Linux 2.4.18 i686-pc-linux-gnu 847
inline Linux 2.4.18 i686-pc-linux-gnu 847
gcc32 Linux 2.4.18 i686-pc-linux-gnu 847
gcc32 Linux 2.4.18 i686-pc-linux-gnu 847
gcc32 Linux 2.4.18 i686-pc-linux-gnu 847
Processor, Processes - times in microseconds - smaller is better
----------------------------------------------------------------
Host OS Mhz null null open selct sig sig fork exec sh
call I/O stat clos TCP inst hndl proc proc proc
--------- ------------- ---- ---- ---- ---- ---- ----- ---- ---- ---- ---- ----
p70 Linux 2.4.18 847 0.37 0.54 2.76 3.61 15.4 0.93 2.92 95.4 1144 5418
p70 Linux 2.4.18 847 0.37 0.54 2.80 3.61 15.9 0.93 2.92 96.3 1130 5414
p70 Linux 2.4.18 847 0.37 0.57 2.78 3.68 16.0 0.93 2.92 95.8 1152 5417
pgo Linux 2.4.18 847 0.35 0.52 2.88 3.42 15.5 0.91 2.92 95.8 1122 5342
pgo Linux 2.4.18 847 0.35 0.52 2.73 3.38 16.8 0.91 2.94 97.4 1107 5332
pgo Linux 2.4.18 847 0.35 0.52 2.83 3.41 13.7 0.91 2.92 95.6 1133 5324
pgoipo Linux 2.4.18 847 0.35 0.53 2.32 2.76 13.3 0.92 2.84 91.9 1131 5267
pgoipo Linux 2.4.18 847 0.35 0.52 2.25 2.76 14.5 0.92 2.84 106. 1120 5259
pgoipo Linux 2.4.18 847 0.35 0.51 2.34 2.81 13.2 0.92 2.84 95.8 1121 5270
inline Linux 2.4.18 847 0.35 0.51 2.26 2.77 13.4 0.92 2.84 105. 1173 5294
inline Linux 2.4.18 847 0.35 0.51 2.26 2.89 13.4 0.92 2.84 91.0 1099 5280
inline Linux 2.4.18 847 0.35 0.51 2.32 2.92 13.3 0.92 2.84 90.6 1126 5329
gcc32 Linux 2.4.18 847 0.35 0.52 3.01 3.67 15.0 0.95 3.10 104. 1200 5532
gcc32 Linux 2.4.18 847 0.35 0.51 3.03 3.73 15.6 0.95 3.10 103. 1182 5521
gcc32 Linux 2.4.18 847 0.35 0.51 3.06 3.76 15.0 0.95 3.10 104. 1169 5520
Context switching - times in microseconds - smaller is better
-------------------------------------------------------------
Host OS 2p/0K 2p/16K 2p/64K 8p/16K 8p/64K 16p/16K 16p/64K
ctxsw ctxsw ctxsw ctxsw ctxsw ctxsw ctxsw
--------- ------------- ----- ------ ------ ------ ------ ------- -------
p70 Linux 2.4.18 0.770 3.9900 13.3 4.5000 163.2 33.3 163.8
p70 Linux 2.4.18 0.700 3.9500 13.7 6.1400 163.4 31.4 163.4
p70 Linux 2.4.18 0.730 4.1900 13.0 7.9100 162.7 37.6 162.9
pgo Linux 2.4.18 0.840 4.1100 22.0 8.9200 164.0 36.6 164.4
pgo Linux 2.4.18 0.820 3.9900 13.0 5.6000 162.6 32.8 163.2
pgo Linux 2.4.18 0.930 3.9900 13.1 4.8700 162.9 33.4 163.4
pgoipo Linux 2.4.18 0.820 3.9100 13.0 6.1800 163.5 30.0 163.5
pgoipo Linux 2.4.18 0.860 3.9600 13.1 5.2000 163.7 33.6 163.6
pgoipo Linux 2.4.18 0.820 4.1000 13.5 5.4900 162.4 33.7 163.2
inline Linux 2.4.18 0.900 4.0800 13.1 7.3500 162.8 30.7 162.9
inline Linux 2.4.18 0.830 4.0600 13.3 7.7100 163.6 33.1 163.9
inline Linux 2.4.18 0.810 3.9300 62.7 4.7700 162.2 31.4 163.3
gcc32 Linux 2.4.18 0.780 4.1100 14.9 8.2400 163.6 33.0 164.3
gcc32 Linux 2.4.18 0.870 4.1900 13.1 4.4300 162.6 30.8 163.0
gcc32 Linux 2.4.18 0.900 4.2000 15.3 6.4100 162.2 30.7 162.5
*Local* Communication latencies in microseconds - smaller is better
-------------------------------------------------------------------
Host OS 2p/0K Pipe AF UDP RPC/ TCP RPC/ TCP
ctxsw UNIX UDP TCP conn
--------- ------------- ----- ----- ---- ----- ----- ----- ----- ----
p70 Linux 2.4.18 0.770 4.111 7.30 13.1 32.8 18.9 44.7 69.1
p70 Linux 2.4.18 0.700 4.405 7.51 13.2 32.8 19.2 45.6 70.1
p70 Linux 2.4.18 0.730 4.392 7.37 13.5 32.8 19.3 44.7 70.8
pgo Linux 2.4.18 0.840 4.187 7.32 11.5 28.6 14.0 36.8 54.4
pgo Linux 2.4.18 0.820 4.354 7.23 11.6 28.4 14.3 36.9 54.8
pgo Linux 2.4.18 0.930 4.386 7.50 11.7 28.6 14.5 37.1 54.9
pgoipo Linux 2.4.18 0.820 4.072 6.83 10.8 27.6 14.0 36.7 53.6
pgoipo Linux 2.4.18 0.860 4.309 7.05 10.9 27.6 14.2 36.3 53.1
pgoipo Linux 2.4.18 0.820 4.168 7.09 11.0 27.7 14.2 37.2 53.3
inline Linux 2.4.18 0.900 4.126 6.96 10.9 27.8 14.1 36.9 53.0
inline Linux 2.4.18 0.830 4.348 6.96 10.8 27.6 14.1 36.7 53.5
inline Linux 2.4.18 0.810 4.363 7.15 10.8 27.3 14.1 36.7 53.7
gcc32 Linux 2.4.18 0.780 4.224 7.33 15.7 35.3 21.6 47.5 72.9
gcc32 Linux 2.4.18 0.870 4.327 7.56 15.7 35.6 21.8 47.1 73.0
gcc32 Linux 2.4.18 0.900 4.377 7.55 15.6 35.5 21.9 48.0 72.8
File & VM system latencies in microseconds - smaller is better
--------------------------------------------------------------
Host OS 0K File 10K File Mmap Prot Page
Create Delete Create Delete Latency Fault Fault
--------- ------------- ------ ------ ------ ------ ------- ----- -----
p70 Linux 2.4.18 17.4 5.0970 101.8 11.6 417.0 0.729 2.00000
p70 Linux 2.4.18 17.5 5.2120 102.3 11.7 420.0 0.729 2.00000
p70 Linux 2.4.18 17.4 5.1150 101.3 11.7 430.0 0.731 2.00000
pgo Linux 2.4.18 18.2 4.9460 102.5 10.9 409.0 0.712 2.00000
pgo Linux 2.4.18 18.1 4.8450 101.6 10.8 422.0 0.700 2.00000
pgo Linux 2.4.18 18.2 4.9180 101.9 10.9 432.0 0.701 2.00000
pgoipo Linux 2.4.18 17.1 4.5070 100.2 10.4 376.0 0.709 2.00000
pgoipo Linux 2.4.18 17.0 4.4400 100.2 10.3 388.0 0.708 2.00000
pgoipo Linux 2.4.18 17.1 4.5340 100.1 10.5 393.0 0.730 2.00000
inline Linux 2.4.18 17.1 4.4790 101.0 10.4 375.0 0.709 2.00000
inline Linux 2.4.18 17.1 4.5270 100.9 10.4 387.0 0.709 2.00000
inline Linux 2.4.18 17.2 4.5390 99.6 10.4 380.0 0.709 2.00000
gcc32 Linux 2.4.18 36.1 5.4180 123.8 12.1 379.0 0.709 2.00000
gcc32 Linux 2.4.18 36.2 5.3890 122.8 12.0 393.0 0.715 2.00000
gcc32 Linux 2.4.18 36.1 5.3990 121.0 12.0 398.0 0.709 2.00000
*Local* Communication bandwidths in MB/s - bigger is better
-----------------------------------------------------------
Host OS Pipe AF TCP File Mmap Bcopy Bcopy Mem Mem
UNIX reread reread (libc) (hand) read write
--------- ------------- ---- ---- ---- ------ ------ ------ ------ ---- -----
p70 Linux 2.4.18 847. 660. 205. 402.5 372.7 157.5 150.8 372. 196.1
p70 Linux 2.4.18 841. 409. 233. 410.2 372.8 153.8 147.5 372. 197.1
p70 Linux 2.4.18 848. 712. 235. 414.5 372.8 156.1 151.5 372. 202.0
pgo Linux 2.4.18 863. 571. 280. 415.1 372.8 152.8 146.8 372. 193.2
pgo Linux 2.4.18 860. 555. 285. 415.1 372.8 151.9 145.3 372. 195.0
pgo Linux 2.4.18 847. 750. 168. 415.4 372.6 152.7 146.6 372. 195.7
pgoipo Linux 2.4.18 869. 704. 237. 417.4 372.9 152.7 146.1 372. 193.1
pgoipo Linux 2.4.18 868. 683. 308. 414.2 372.9 151.5 145.3 372. 194.9
pgoipo Linux 2.4.18 866. 393. 220. 413.9 372.9 152.8 146.4 372. 195.8
inline Linux 2.4.18 880. 550. 223. 406.1 372.6 152.9 146.7 372. 191.8
inline Linux 2.4.18 803. 345. 212. 416.7 372.9 151.5 145.3 372. 195.0
inline Linux 2.4.18 872. 704. 236. 413.6 372.9 152.7 146.2 372. 195.9
gcc32 Linux 2.4.18 872. 612. 190. 414.0 372.8 158.5 151.2 372. 194.9
gcc32 Linux 2.4.18 868. 384. 230. 416.8 372.5 155.2 150.1 372. 199.4
gcc32 Linux 2.4.18 856. 675. 196. 416.6 372.8 157.1 151.8 372. 202.8
Memory latencies in nanoseconds - smaller is better
(WARNING - may not be correct, check graphs)
---------------------------------------------------
Host OS Mhz L1 $ L2 $ Main mem Guesses
--------- ------------- ---- ----- ------ -------- -------
p70 Linux 2.4.18 847 3.540 8.2610 131.8
p70 Linux 2.4.18 847 3.540 8.2630 131.8
p70 Linux 2.4.18 847 3.541 8.2610 131.8
pgo Linux 2.4.18 847 3.541 8.2600 131.8
pgo Linux 2.4.18 847 3.541 8.2600 131.8
pgo Linux 2.4.18 847 3.541 8.2610 131.8
pgoipo Linux 2.4.18 847 3.540 8.2710 131.8
pgoipo Linux 2.4.18 847 3.540 8.2700 131.8
pgoipo Linux 2.4.18 847 3.541 8.2610 131.8
inline Linux 2.4.18 847 3.541 8.2610 131.8
inline Linux 2.4.18 847 3.540 8.2610 131.8
inline Linux 2.4.18 847 3.541 8.2700 131.8
gcc32 Linux 2.4.18 847 3.541 46.8 131.8
gcc32 Linux 2.4.18 847 3.541 8.2610 131.8
gcc32 Linux 2.4.18 847 3.540 8.2610 131.8
On Mon, Jan 20, 2003 at 05:11:14PM +0000, you [John Bradford] wrote:
> > > > Does Intels C++ compiler for Linux works fine for compiling the Linux
> > > > kernel? It is not 100% compatible, as far as I know.
> > >
> > > I doubt it - Linux makes extensive use of GCC compiler extensions.
> >
> > I doubt your doubting. It works.
>
> I'm suprised. Sorry once again for the mis-information, (heh, but at
> least it was on-topic, which is somewhat amasing for this mailing list
> :-) ). Is there a concious effort to make it compile the kernel, or
> are they aiming for general GCC compliance?
I guess both. See
http://lists.insecure.org/lists/linux-kernel/2002/Oct/6450.html
Also, Intel has for long aimed to make icc on Linux to be as gcc compliant
as possible.
-- v --
[email protected]