CHUNK_REQUEST_THREAD_POOL_SIZE_TOTAL?

[MrGrey1]

Any one able to provide further information or insight on this particular setting?
`CHUNK_REQUEST_THREAD_POOL_SIZE_TOTAL = 10 //Thread pool size for chunk requests (from disk and generated)`
Should it be based off of number of CPUs or is it related or proportional to
`CHUNK_REQUEST_THREAD_POOL_SIZE_CPU = 2` ?

 

[AndyP]

The first setting
CHUNK_REQUEST_THREAD_POOL_SIZE_TOTAL
defined the thread pool size for the chunk generation.
Keeping it on default (25) is fine for most use cases.

CHUNK_REQUEST_THREAD_POOL_SIZE_CPU
Is the number of threads that will be used for generation.
It should be ideally one below your physical cores. (To have one core free for the main thread, ideally)

The only need to change the latter value would be for CPUs with more than usual cores (like 8+) to increase the loading and generation performance a bit.
The first value should not be increased unless you have a higher value for CPU than the TOTAL.
But you would have to try higher values then and watch the performance,
as increasing the total also increases the memory usage for generating and loading.

- Andy

 

[MrGrey1]

Thanks Andy, just one query on your response,
"Keeping it on default (25) is fine for most use cases."?
In the settings I have on my servers the default appears to be 10. Can you confirm, is the default 10 or 25?

 

[AndyP]

The default is 10.
Indeed.

It was changed from 25 to 10 at some point. (>1 year ago)
Copied this from my "release installation" and this has never needed a reinstall or reset of config files, so it has still the initial value when the setting was added, my fault.

- Andy