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Re: [PATCH 1/2] Single thread optimization for malloc atomics
- From: OndÅej BÃlka <neleai at seznam dot cz>
- To: Adhemerval Zanella <azanella at linux dot vnet dot ibm dot com>
- Cc: "GNU C. Library" <libc-alpha at sourceware dot org>
- Date: Wed, 30 Apr 2014 16:18:45 +0200
- Subject: Re: [PATCH 1/2] Single thread optimization for malloc atomics
- Authentication-results: sourceware.org; auth=none
- References: <53610133 dot 3070908 at linux dot vnet dot ibm dot com>
On Wed, Apr 30, 2014 at 10:57:07AM -0300, Adhemerval Zanella wrote:
> This patch adds a single-thread optimization for malloc atomic usage to
> first check if process is single-thread (ST) and if so use normal
> load/store instead of atomic instructions.
>
How fast is tls on power? When we add a per-thread cache as I suggested
then it would have most of time same performance as singlethread, with
overhead one tls variable access per malloc call.