Ram usage

[Krzysztof Grzelak]

I have a question, how much RAM is needed in a computer to test chess engines which will use the following RAM:
-4096
-8192
-16384
-32768
-65536
-98304

Thank you in advance for any information.

[yurikvelo]

Fishtest use 64 Mb hash (128 Mb per game pair)
With 4 Gb RAM you can run 16 game pairs simultaneously

[Krzysztof Grzelak]

Fishtest use 64 Mb hash (128 Mb per game pair)
With 4 Gb RAM you can run 16 game pairs simultaneously

Thank you for your answer yurikvelo. I have a question, why is it that if I set the hash 65536 in Stockfish, I show an error. However, other engines do not have such an error, for example Houdini, Komodo. I'm sorry but I can't understand why this is happening.

[RubiChess]

Fishtest use 64 Mb hash (128 Mb per game pair)
With 4 Gb RAM you can run 16 game pairs simultaneously

Thank you for your answer yurikvelo. I have a question, why is it that if I set the hash 65536 in Stockfish, I show an error. However, other engines do not have such an error, for example Houdini, Komodo. I'm sorry but I can't understand why this is happening.

You are aware that 65536 is in MByte which means that you try to allocate 64GB RAM for the engine? Do you have a computer with more than 64GB RAM (remember that the OS and maybe a second engine also need some RAM)?

[Krzysztof Grzelak]

You are aware that 65536 is in MByte which means that you try to allocate 64GB RAM for the engine? Do you have a computer with more than 64GB RAM (remember that the OS and maybe a second engine also need some RAM)?

Of course you're right I have 128 GB of RAM. I'm playing a Houdini - Komodo match with a hash set of 65536, and I'm fine. Stockfish always shows an error and I can't install it (I'm talking about hash 65536).

[Sopel]

You are aware that 65536 is in MByte which means that you try to allocate 64GB RAM for the engine? Do you have a computer with more than 64GB RAM (remember that the OS and maybe a second engine also need some RAM)?

Of course you're right I have 128 GB of RAM. I'm playing a Houdini - Komodo match with a hash set of 65536, and I'm fine. Stockfish always shows an error and I can't install it (I'm talking about hash 65536).

If you set each engine to 50% of total RAM you will inevitably run into memory problems and cripple either or both of the engines in unpredictable ways undermining the test completely.

[Modern Times]

I may be in the minority here, but I find these huge hash sizes (e.g. 64GB, 128GB) ridiculous. Just because you can does not mean you should, and where is the evidence that it improves engine performance and strength ?

[Magnum]

I have a question, how much RAM is needed in a computer to test chess engines which will use the following RAM:
-4096
-8192
-16384
-32768
-65536
-98304

Thank you in advance for any information.

64 GB RAM or more.

[RubiChess]

Maybe you need this: https://en.wikipedia.org/wiki/SoftRAM

[Krzysztof Grzelak]

I may be in the minority here, but I find these huge hash sizes (e.g. 64GB, 128GB) ridiculous. Just because you can does not mean you should, and where is the evidence that it improves engine performance and strength ?

And why do you think so.I understand that for a TCEC tournament they would give a hash of 1024, it would be okay for you.