Stockfish 1.6.3 JA update available

[Eelco de Groot]

Marco/Jim,

There is something strange going on when I load the engine in Arena with 1GB hash.

If I use 4 threads, then the hash is correctly set at 1GB. If I use 2 threads, no extra hash is set, same with 1 thread.

I loaded 1.6.2 JA and tried the same, this works like it should with 1GB hash for both 1, 2 and 4 threads.

Any idea?

Martin, I probably misunderstand but how exactly do you mean "extra hash"? Is there some default value Stockfish resorts to? The 1 gigabyte should be shared by all the threads so what does extra hash mean in this context?

Regards, Eelco

[zullil]

Marco/Jim,

There is something strange going on when I load the engine in Arena with 1GB hash.

If I use 4 threads, then the hash is correctly set at 1GB. If I use 2 threads, no extra hash is set, same with 1 thread.

I loaded 1.6.2 JA and tried the same, this works like it should with 1GB hash for both 1, 2 and 4 threads.

Any idea?

Martin, I probably misunderstand but how exactly do you mean "extra hash"? Is there some default value Stockfish resorts to? The 1 gigabyte should be shared by all the threads so what does extra hash mean in this context?

Regards, Eelco

I believe the default value is 32M, which is set in ucioptions.cpp. I'm not understanding Martin's post.

[Martin Thoresen]

Marco/Jim,

There is something strange going on when I load the engine in Arena with 1GB hash.

If I use 4 threads, then the hash is correctly set at 1GB. If I use 2 threads, no extra hash is set, same with 1 thread.

I loaded 1.6.2 JA and tried the same, this works like it should with 1GB hash for both 1, 2 and 4 threads.

Any idea?

Martin, I probably misunderstand but how exactly do you mean "extra hash"? Is there some default value Stockfish resorts to? The 1 gigabyte should be shared by all the threads so what does extra hash mean in this context?

Regards, Eelco

I believe the default value is 32M, which is set in ucioptions.cpp. I'm not understanding Martin's post.

Yes, that is correct.

When I specify 1GB hash I get this in task manager:

1.6.3 JA
1 thread ~40 MB
2 threads ~40 MB
4 thread ~1 GB

With 1.6.2 JA it's this:
1 thread ~ 1 GB
2 threads ~ 1 GB
4 threads ~ 1 GB

Any clearer?

Doesn't make any sense to me why I can't run 1 or 2 threads with anything else than the default 32MB hash.

[Eelco de Groot]

Code: Select all

o["Hash"] = Option(32, 4, 4096);

Yes, 32 Mb is the default value see the Stockfish 1.5 code above, 4 minimum and 4096 maximum settings in the parameter window but the maximum is now set higher, to 8192 I presume in Stockfish 1.6.3. It could be a problem in Arena?

Regards Eelco

[zullil]

Marco/Jim,

There is something strange going on when I load the engine in Arena with 1GB hash.

If I use 4 threads, then the hash is correctly set at 1GB. If I use 2 threads, no extra hash is set, same with 1 thread.

I loaded 1.6.2 JA and tried the same, this works like it should with 1GB hash for both 1, 2 and 4 threads.

Any idea?

Martin, I probably misunderstand but how exactly do you mean "extra hash"? Is there some default value Stockfish resorts to? The 1 gigabyte should be shared by all the threads so what does extra hash mean in this context?

Regards, Eelco

I believe the default value is 32M, which is set in ucioptions.cpp. I'm not understanding Martin's post.

Yes, that is correct.

When I specify 1GB hash I get this in task manager:

1.6.3 JA
1 thread ~40 MB
2 threads ~40 MB
4 thread ~1 GB

With 1.6.2 JA it's this:
1 thread ~ 1 GB
2 threads ~ 1 GB
4 threads ~ 1 GB

Any clearer?

Doesn't make any sense to me why I can't run 1 or 2 threads with anything else than the default 32MB hash.

Yes, very clear now. Thanks.

This problem does not exist for me with 1.6.3. I just tested various settings for Threads and Hash, and amount of memory requested was reserved no matter how many threads I used.

I'm running my own build of Stockfish on a Mac, and I'm testing from the command line. So this might be a Windows or Linux issue, a problem with the compile, or a problem with Arena (though not likely Arena if 1.6.2 works correctly under Arena).

[Eelco de Groot]

Marco/Jim,

There is something strange going on when I load the engine in Arena with 1GB hash.

If I use 4 threads, then the hash is correctly set at 1GB. If I use 2 threads, no extra hash is set, same with 1 thread.

I loaded 1.6.2 JA and tried the same, this works like it should with 1GB hash for both 1, 2 and 4 threads.

Any idea?

Martin, I probably misunderstand but how exactly do you mean "extra hash"? Is there some default value Stockfish resorts to? The 1 gigabyte should be shared by all the threads so what does extra hash mean in this context?

Regards, Eelco

I believe the default value is 32M, which is set in ucioptions.cpp. I'm not understanding Martin's post.

Yes, that is correct.

When I specify 1GB hash I get this in task manager:

1.6.3 JA
1 thread ~40 MB
2 threads ~40 MB
4 thread ~1 GB

With 1.6.2 JA it's this:
1 thread ~ 1 GB
2 threads ~ 1 GB
4 threads ~ 1 GB

Any clearer?

Doesn't make any sense to me why I can't run 1 or 2 threads with anything else than the default 32MB hash.

Very strange, thanks for the explanation Martin. I have no idea what could be the problem I don't have Arena installed. In case you have 64 bits you could try Dann's 1.6.3(dc)s compile.

Regards Eelco

[Martin Thoresen]

Very strange, thanks for the explanation Martin. I have no idea what could be the problem I don't have Arena installed. In case you have 64 bits you could try Dann's 1.6.3(dc)s compile.

Regards Eelco

Yes, I'm on a 64-bit system.

I just installed the 1.6.3 DC compile and here are the results:

1 thread ~ 40 MB
2 threads ~ 40 MB
4 threads ~ 40 MB

Unable to set more hash than default no matter how many thread!

Really, really strange.

Arena version 2.01

[Martin Thoresen]

Well, I just tried the 1.6.3 JA build again and now it works fine, all of a sudden.

Really confusing.

I'll get back to this if it's seems it's a real issue. For now, let's just say it was a fluke.

[Hugo]

Hello

I read in the readme file that hashtables over 2GB( upto 8GB) should work now . But I cant get more than 2 GB
Sytem: i7 950, os Win7 ultimate 64bit, 6GB RAM.

Any suggestions wellcome.

Clemens

Hi Clemens,

Could you state the knps figures of SF163x64 for 2, 4, 6, 8 cores?

Hi Harun

sorry, I cant. Think it makes no sense, because this machine is overclocked(4,232MHz) and has only 4 cores, HT is off and btw. HT threads cannot be counted as cores . Search speed is arround 8500Kns.

Regards, Clemens

[beachknight]

Hello

I read in the readme file that hashtables over 2GB( upto 8GB) should work now . But I cant get more than 2 GB
Sytem: i7 950, os Win7 ultimate 64bit, 6GB RAM.

Any suggestions wellcome.

Clemens

Hi Clemens,

Could you state the knps figures of SF163x64 for 2, 4, 6, 8 cores?

Hi Harun

sorry, I cant. Think it makes no sense, because this machine is overclocked(4,232MHz) and has only 4 cores, HT is off and btw. HT threads cannot be counted as cores . Search speed is arround 8500Kns.

Regards, Clemens

No problem, Clemens. This is not the end of the world. 8500 kNpS on
4 threads would definitely make 10625 kNpS on 8 threads.

Thanks.