* gcc 3.1 branch slowdown?
@ 2002-07-20 18:24 H. J. Lu
2002-07-21 1:04 ` David Edelsohn
2002-07-23 23:12 ` Loren James Rittle
0 siblings, 2 replies; 4+ messages in thread
From: H. J. Lu @ 2002-07-20 18:24 UTC (permalink / raw)
To: gcc
I noticed a slowdown on 3.1 branch between 0709 and 0711.
1. "make bootstrap" on 0709 takes
real 34m43.021s
user 51m12.280s
sys 10m46.560s
2. "make bootstrap" on 0711 takes
real 40m26.992s
user 52m21.290s
sys 11m1.410s
3. "make bootstrap" on 0717 takes
real 52m55.189s
user 52m20.570s
sys 10m53.770s
BTW, it is on Linux/i686. Has anyone else seen it?
H.J.
^ permalink raw reply [flat|nested] 4+ messages in thread
* Re: gcc 3.1 branch slowdown?
2002-07-20 18:24 gcc 3.1 branch slowdown? H. J. Lu
@ 2002-07-21 1:04 ` David Edelsohn
2002-07-23 23:12 ` Loren James Rittle
1 sibling, 0 replies; 4+ messages in thread
From: David Edelsohn @ 2002-07-21 1:04 UTC (permalink / raw)
To: H. J. Lu; +Cc: gcc
>>>>> H J Lu writes:
HJ> I noticed a slowdown on 3.1 branch between 0709 and 0711.
HJ> BTW, it is on Linux/i686. Has anyone else seen it?
While bootstrap may be slower, it does not necessarily mean that
the compiler is slower. Possibly the C++ correctness fixes are slowing
down compiling libstdc++?
David
^ permalink raw reply [flat|nested] 4+ messages in thread
* Re: gcc 3.1 branch slowdown?
2002-07-20 18:24 gcc 3.1 branch slowdown? H. J. Lu
2002-07-21 1:04 ` David Edelsohn
@ 2002-07-23 23:12 ` Loren James Rittle
1 sibling, 0 replies; 4+ messages in thread
From: Loren James Rittle @ 2002-07-23 23:12 UTC (permalink / raw)
To: gcc
> 1. "make bootstrap" on 0709 takes [...]
> user 51m12.280s
> sys 10m46.560s
> 2. "make bootstrap" on 0711 takes [...]
> user 52m21.290s
> sys 11m1.410s
> 3. "make bootstrap" on 0717 takes [...]
> user 52m20.570s
> sys 10m53.770s
From the data posted, all we know is that you likely tested on an
[S]MP machine. Ignoring real time, AKA wall-time (as I think we must
since we don't know your other system load...):
For 0709, total CPU time was: ~62 minutes
For 0711, total CPU time was: ~63 minutes
For 0717, total CPU time was: ~63 minutes
Regards,
Loren
^ permalink raw reply [flat|nested] 4+ messages in thread
* Re: gcc 3.1 branch slowdown?
@ 2002-07-24 7:19 Loren James Rittle
0 siblings, 0 replies; 4+ messages in thread
From: Loren James Rittle @ 2002-07-24 7:19 UTC (permalink / raw)
To: gcc; +Cc: hjl
Responding to HJL, I wrote on the public gcc list:
>> For 0709, total CPU time was: ~62 minutes
>> For 0711, total CPU time was: ~63 minutes
>> For 0717, total CPU time was: ~63 minutes
Someone indirectly asked me in private e-mail why those facts matter
at all. Perhaps, they don't (which I why I stated the sole
near-absolute conclusion that could be reached from the posted data
before observing the near-constant CPU time ;-). However, in my
experience, they do matter.
More to the point, I should have added: From another i386 machine
covering those dates with 3.1.1 prerelease, I saw no regression in
total wall update/build/check time (at -j1 on a single CPU with ~512MB
of physical memory which has not used one iota of swap space since
being booted at the end of June):
07/08 posted first final results at 17:54.
07/10 posted first final results at 17:49.
07/12 posted first final results at 17:54.
07/14 posted first final results at 18:04.
07/16 posted first final results at 17:56.
07/18 posted first final results at 18:04.
07/20 posted first final results at 17:49.
07/22 posted first final results at 18:00.
All days above completed the same total work (with the possible
exception of a high-variance wall time to run ``cvs update'' in the
source tree) and started at the same time (13:51). The jobs ran at
``nice -10'' thus all other jobs on the system tended to get CPU
before these jobs. At this point, it is unknown whether any other
real jobs ran those days. It appears to me that the other load was
"light/none".
Regards,
Loren
^ permalink raw reply [flat|nested] 4+ messages in thread
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2002-07-20 18:24 gcc 3.1 branch slowdown? H. J. Lu
2002-07-21 1:04 ` David Edelsohn
2002-07-23 23:12 ` Loren James Rittle
2002-07-24 7:19 Loren James Rittle
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