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Re: Systemtap benchmarking doc draft
- From: Martin Hunt <hunt at redhat dot com>
- To: William Cohen <wcohen at redhat dot com>
- Cc: SystemTAP <systemtap at sources dot redhat dot com>
- Date: Tue, 28 Feb 2006 12:04:10 -0800
- Subject: Re: Systemtap benchmarking doc draft
- Organization: Red Hat Inc.
- References: <440369D1.6030705@redhat.com>
On Mon, 2006-02-27 at 16:06 -0500, William Cohen wrote:
> SystemTap Language micro metrics (costs of various operations):
> cost of associative array operations
transport speed (both maximum and writing to disk)
transport overhead (how much cpu time it takes)
printf overhead
probe overhead (all the stuff the translator emits for each probe)
stack dump/trace
symbolic lookup
systemtap function call overhead
systemtap string operations (things like concatenation do
many string copies and are slow)
> Kernel instrumentation limits:
> Number of probes that can be registered at a time
> Number of kretprobes active
>
> SystemTap limits:
> Maximum elements in associative array
This is a define. Probably needs to be a variable. Anyway, it is
adjustable.
> Number of actions/steps in probe.
Ditto
Martin