Re: [Help-glpk] Performance decrease with more powerful computer

[Reginald Beardsley]

Looking at the descriptions I think you're thrashing.  Add more memory to system 1, unless of course there's a typo and that should read "32GiB" instead of "3GiB"

--- On Fri, 2/1/13, Patrik Dufresne <address@hidden> wrote:

From: Patrik Dufresne <address@hidden>
Subject: Re: [Help-glpk] Performance decrease with more powerful computer
To: "Reginald Beardsley" <address@hidden>
Cc: "glpk" <address@hidden>
Date: Friday, February 1, 2013, 9:49 AM

Hi Reginald,

Here are the hardware specs i'm comparing.

System 1

Windows XP SP2

Intel Core i5 650 @ 3.20GHz 4 MB Cache
3GiB DDR3 1066/1333
CPU mark (according to cpubenchmark.net) : 3154

Total computation time : 331 sec

System 2

Windows XP SP2, Windows 7 64bits, Debian 64bits

Core i7 CPU M 620 @ 2.67GHz 4M Cache
4GiB DDR3 1066
CPU mark (according to cpubenchmark.net) : 2718

Total computation time : 114 secs

System 3

Windows XP SP2, Debian 64bits

Core 2 Duo CPU E6550 @ 2.33GHz 4 MB Cache L2
4GiB DDR2 800
CPU mark (according to cpubenchmark.net) : 1493

Total computation time : 172 secs

I didn't run the benchmark on the computer it self, but the different between the number is big enough to expect better performance from System no 1 then System no 3. The total computation time of the problem on different platform for the same computer are almost identical. (less then 0.5 sec different). It's safe to assume the platform doesn't have any impact on the performance.

I'm using GLPK 4.47 on every platform. On Linux, I did compile it from source with default flags. For Windows, I pick the pre-compiled version provided by winglpk project.

To solve the problem, I need to run GLPK multiple time sequentially. I may provide dump of every instance of the problem.

Patrik Dufresne

On Fri, Feb 1, 2013 at 10:23 AM, Reginald Beardsley <address@hidden> wrote:

Could you  provide a few details? 

System configurations you're comparing?  GLPK version?  Compile time options specified?

There are a huge number of possibilities.  Why do you think the computer is "more powerful"?

Reg



--- On Fri, 2/1/13, Patrik Dufresne <address@hidden> wrote:

From: Patrik Dufresne <address@hidden>
Subject: [Help-glpk] Performance decrease with more powerful computer
To: "GLPK help" <address@hidden>
Date: Friday, February 1, 2013, 8:56 AM

Hi,

I'm using GLPK in one project and the time taken to compute is longer on a more powerful computer. Does it make any sense to you ? 

I don't have any clues about how to debug it. I would really appreciate tips to diagnose the problem.

Patrik Dufresne

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