Hi!
> I have conducted some experiments to compare kernels built with -O2
> and -O3. Here are the results:
>
> Application Performance O2 Performance O3 Improvement
> Apache 127814.14 req/s 130321.24 req/s 1.96%
> Nginx537589.08 req/s 556723.32 req/s 3.56%
> MySQL70
On 2015-04-08 09:19, Pengfei Yuan wrote:
2015-04-08 20:06 GMT+08:00 Austin S Hemmelgarn :
I can't remember any off the top of my head, but it does say explicitly in
the GCC manual to be careful with -O3. IIRC, most of the issues relate to
-O3 enabling -ffast-math (which tends to really mess wit
Am 08.04.2015 um 15:16 schrieb Pengfei Yuan:
> 2015-04-08 20:19 GMT+08:00 Richard Weinberger :
>> On Wed, Apr 8, 2015 at 3:00 AM, Pengfei Yuan <0xcool...@gmail.com> wrote:
>>> Could you please provide some examples that I can investigate?
>>> Thanks!
>>
>> It would be awesome if you could find out
2015-04-08 20:06 GMT+08:00 Austin S Hemmelgarn :
> I can't remember any off the top of my head, but it does say explicitly in
> the GCC manual to be careful with -O3. IIRC, most of the issues relate to
> -O3 enabling -ffast-math (which tends to really mess with code that expects
> strict IEEE 754
2015-04-08 20:19 GMT+08:00 Richard Weinberger :
> On Wed, Apr 8, 2015 at 3:00 AM, Pengfei Yuan <0xcool...@gmail.com> wrote:
>> Could you please provide some examples that I can investigate?
>> Thanks!
>
> It would be awesome if you could find out which gcc optimizations
> cause the speed up.
> "gcc
> I can't remember any off the top of my head, but it does say explicitly
> in the GCC manual to be careful with -O3. IIRC, most of the issues
> relate to -O3 enabling -ffast-math (which tends to really mess with code
> that expects strict IEEE 754 compliance), so it may not be as much of an
>
On 2015-04-08 08:19, Richard Weinberger wrote:
On Wed, Apr 8, 2015 at 3:00 AM, Pengfei Yuan <0xcool...@gmail.com> wrote:
Could you please provide some examples that I can investigate?
Thanks!
It would be awesome if you could find out which gcc optimizations
cause the speed up.
"gcc -c -Q -O3 -
On Wed, Apr 8, 2015 at 3:00 AM, Pengfei Yuan <0xcool...@gmail.com> wrote:
> Could you please provide some examples that I can investigate?
> Thanks!
It would be awesome if you could find out which gcc optimizations
cause the speed up.
"gcc -c -Q -O3 --help=optimizers" will help you.
Please also d
On 2015-04-07 21:00, Pengfei Yuan wrote:
Could you please provide some examples that I can investigate?
Thanks!
2015-04-08 2:05 GMT+08:00 Austin S Hemmelgarn :
On 2015-04-07 06:09, Mike Galbraith wrote:
On Tue, 2015-04-07 at 15:56 +0800, Pengfei Yuan wrote:
I am trying legacy GCC versions.
Bu
Could you please provide some examples that I can investigate?
Thanks!
2015-04-08 2:05 GMT+08:00 Austin S Hemmelgarn :
> On 2015-04-07 06:09, Mike Galbraith wrote:
>> On Tue, 2015-04-07 at 15:56 +0800, Pengfei Yuan wrote:
>>> I am trying legacy GCC versions.
>>> But I am not able to try different
On 2015-04-07 06:09, Mike Galbraith wrote:
> On Tue, 2015-04-07 at 15:56 +0800, Pengfei Yuan wrote:
>> I am trying legacy GCC versions.
>> But I am not able to try different architectures.
>
> The point of my reply wasn't to get you to actually test the world ;-)
>
> I was indirectly pointing out
On Tue, 2015-04-07 at 15:56 +0800, Pengfei Yuan wrote:
> I am trying legacy GCC versions.
> But I am not able to try different architectures.
The point of my reply wasn't to get you to actually test the world ;-)
I was indirectly pointing out that "works for me" is not good enough
justification.
On Tue, 2015-04-07 at 10:07 +0300, Boaz Harrosh wrote:
>
> He did say optional. So I'd imagine it would be a Kconfig of its own.
> So the default can be as today, but people that want to experiment
> need not hack the source code.
Anybody wanting to play with it will just twiddle the Makefile.
I am trying legacy GCC versions.
But I am not able to try different architectures.
2015-04-07 14:43 GMT+08:00 Mike Galbraith :
> On Tue, 2015-04-07 at 11:37 +0800, Pengfei Yuan wrote:
>> Hi,
>>
>> I have conducted some experiments to compare kernels built with -O2
>> and -O3. Here are the results:
On 04/07/2015 09:43 AM, Mike Galbraith wrote:
> On Tue, 2015-04-07 at 11:37 +0800, Pengfei Yuan wrote:
>> Hi,
>>
>> I have conducted some experiments to compare kernels built with -O2
>> and -O3. Here are the results:
>>
>> Application Performance O2 Performance O3 Improvement
>> Apache
On Tue, 2015-04-07 at 11:37 +0800, Pengfei Yuan wrote:
> Hi,
>
> I have conducted some experiments to compare kernels built with -O2
> and -O3. Here are the results:
>
> Application Performance O2 Performance O3 Improvement
> Apache 127814.14 req/s 130321.24 req/s 1.96%
> Nginx
Hi,
I have conducted some experiments to compare kernels built with -O2
and -O3. Here are the results:
Application Performance O2 Performance O3 Improvement
Apache 127814.14 req/s 130321.24 req/s 1.96%
Nginx537589.08 req/s 556723.32 req/s 3.56%
MySQL70661.38 tx/s
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