[PATCH 2/2] libdw: Rewrite the memory handler to be more robust.

Mark Wielaard mark@klomp.org
Fri Nov 8 16:22:00 GMT 2019

On Thu, 2019-11-07 at 12:40 -0600, Jonathon Anderson wrote:
> I haven't benchmarked this version, but I did benchmark the equivalent 
> earlier version (this version is almost quite literally a rebase of the 
> other). I don't have the exact results on hand, what I remember is that 
> the pthread_key method was faster (and handled the many-thread case 
> better), by maybe a factor of 1.5x-2x in parallel. In serial the 
> overhead was minimal (just an extra pointer indirection on allocations).

I just tested the single-threaded case a bit and is not measurable
slower than the previous version, and compared to 0.177 things are
maybe ~1% slower (so probably in the noise).

A factor 1.5x-2.0x slower in parallel does seem significant. Is that in
the case of many-threads that are colliding a lot or in general?



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