[Haskell-cafe] Best ways to achieve throughput, for large M:N ratio of STM threads, with hot TVar updates?

[Compl Yue]

Hi Jo,

Thanks anyway and FYI the global counter originally served as a source 
for unique entity id, then later I have replaced it with UUID from uuid 
package, seems not a problem since then.

Regards,

Compl


On 2020/7/30 上午1:37, Joachim Durchholz wrote:
> Am 24.07.20 um 17:48 schrieb Compl Yue via Haskell-Cafe:
>> The global counter is only used to reveal the technical traits of my 
>> situation, it's of course not a requirement of my business needs.
>
> Given the other discussion here, I'm not sure if it's really relevant 
> to your situation, but that stats counter could indeed be causing lock 
> contention. Which means your numbers may be skewed, and you may be 
> drawing wrong conclusions - which is actually commonplace in 
> benchmarking.
>
> Two things you could do:
> 1) Leave the global counter out and see whether the running times 
> vary. There's still a chance that while the overall running time is 
> the same, the code might now be hitting a different bottleneck. Or 
> maybe the counter isn't the bottleneck but it would become one once 
> you have done the other optimizations. So that experiment is cheap but 
> gives you no more than a preliminary result.
> 2) Let each thread collect its own statistics, and coalesce into the 
> global counter only once in a while. (Vary the "once in a while" 
> determination and see whether it changes anything.)
>
> Just my 2c from the sideline.
>
> Regards,
> Jo
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