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Re: Meeting minutes 20060727

From: "Gui,Jian" <guij at cn dot ibm dot com>
To: jrs at us dot ibm dot com
Cc: Masami Hiramatsu <masami dot hiramatsu dot pt at hitachi dot com>, Elena Zannoni <ezannoni at redhat dot com>, systemtap at sources dot redhat dot com, Mathieu Desnoyers <mathieu dot desnoyers at polymtl dot ca>
Date: Fri, 04 Aug 2006 10:11:49 +0800
Subject: Re: Meeting minutes 20060727
References: <17614.3291.110400.236235@localhost.redhat.com> <44CF0AA0.3060709@us.ibm.com> <44CF8846.9010304@hitachi.com> <44D1834A.8010301@us.ibm.com>

Jose R. Santos writes:


[...] Gui Jian is currently working to implement this and his results
are encouraging. [...]

Here are the results of different timing functions mentioned above. I used a multi-thread(8 threads) app which calls getsid() in a loop running on a 4-way ppc64 box. The kernel is 2.6.17.7 and CONFIG_CPU_FREQ is set.

We tried to use different timing functions in LKET. The numbers are average microseconds for each getsid() in all cpus.

--------------
             (do_gettimeofday)  (get_cycles)  (_stp_gettimeofday_us)

original LKET: 4216 4045 (-4.05%) 4276 (+1.42%)

no data transfer: 3677 3526 (-4.10%) 3769 (+2.52%)

References:
- Meeting minutes 20060727
  - From: Elena Zannoni
- Re: Meeting minutes 20060727
  - From: Jose R. Santos
- Re: Meeting minutes 20060727
  - From: Masami Hiramatsu
- Re: Meeting minutes 20060727
  - From: Jose R. Santos

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