From mboxrd@z Thu Jan  1 00:00:00 1970
From: wcohen@redhat.com (William Cohen)
Date: Tue, 15 Feb 2011 11:25:24 -0500
Subject: [ltt-dev] LTTng-UST vs SystemTap userspace tracing benchmarks
In-Reply-To: <4D5AA164.1050607@polymtl.ca>
References: <4D5AA164.1050607@polymtl.ca>
Message-ID: <4D5AA8F4.8060902@redhat.com>

On 02/15/2011 10:53 AM, Julien Desfossez wrote:
> LTTng-UST vs SystemTap userspace tracing benchmarks
> 
> February 15th, 2011
> 
> Authors: Mathieu Desnoyers <mathieu.desnoyers at efficios.com>
>          Julien Desfossez <julien.desfossez at polymtl.ca>

> * SystemTap probe (stap testutrace.stp -F) :
> probe process("./.libs/tracepoint_benchmark").mark("single_trace") {
>     printf("%d : %s\n", gettimeofday_ns(), $arg1);
> }



Hi Julien,

How much of the SystemTap overhead is due to the printf() statement in the probe? What is the run time for the following:

probe process("./.libs/tracepoint_benchmark").mark("single_trace") {}


Is the code for the benchmarks available, so we can take a look at reducing the overhead of SystemTap?

-Will