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Re: LTTng-UST vs SystemTap userspace tracing benchmarks
- From: fche at redhat dot com (Frank Ch. Eigler)
- To: Mathieu Desnoyers <mathieu dot desnoyers at efficios dot com>
- Cc: dominique dot toupin at ericsson dot com, ltt-dev at lists dot casi dot polymtl dot ca, systemtap at sources dot redhat dot com
- Date: Tue, 15 Feb 2011 12:39:25 -0500
- Subject: Re: LTTng-UST vs SystemTap userspace tracing benchmarks
- References: <4D5AA164.1050607@polymtl.ca> <y0mvd0ltgba.fsf@fche.csb> <20110215165429.GA27627@Krystal>
Hi -
mathieu.desnoyers wrote:
> [...]
>> This is not that surprising, considering how the two tools work. UST
>> does its work in userspace,
> This first part of the statement is true,
>
>> and is therefore focused on an individual process's activities.
> This is incorrect. LTTng and UST gather traces from multiple processes and from
> the kernel, and merge them in post-processing. [...]
Isn't such after-the-fact merging out of scope of the present
microbenchmark, and in any case applicable to both tools?
- FChE