[LTP] Reduce loop count to meet need of low performance platform

[LTP] Reduce loop count to meet need of low performance platform

[xufeifei via ltp]

From xufeifei <xufeifei1@oppo.com> # This line is ignored.
From: xufeifei <xufeifei1@oppo.com>
Reply-To:
Subject: Reduce loop count to meet need of low performance platform
In-Reply-To:


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[LTP] [PATCH] Reduce loop count to meet need of low performance terminals

[xufeifei via ltp]

Signed-off-by: xufeifei <xufeifei1@oppo.com>
---
 runtest/sched | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/runtest/sched b/runtest/sched
index 5dab7a4c2..02a77040c 100644
--- a/runtest/sched
+++ b/runtest/sched
@@ -9,7 +9,7 @@ trace_sched01           trace_sched -c 1
 cfs_bandwidth01 cfs_bandwidth01 -i 5
 hackbench01 hackbench 50 process 1000
 hackbench02 hackbench 20 thread 1000
-starvation starvation
+starvation starvation -l 100000

 proc_sched_rt01 proc_sched_rt01

--
2.17.1

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Re: [LTP] [PATCH] Reduce loop count to meet need of low performance terminals

[Cyril Hrubis]

Hi!
> --- a/runtest/sched
> +++ b/runtest/sched
> @@ -9,7 +9,7 @@ trace_sched01           trace_sched -c 1
>  cfs_bandwidth01 cfs_bandwidth01 -i 5
>  hackbench01 hackbench 50 process 1000
>  hackbench02 hackbench 20 thread 1000
> -starvation starvation
> +starvation starvation -l 100000

Are you sure that your kernel isn't affected by the bug the test checks
for? The test timeouts on a buggy kernel.

How long does the test run if you disable timeouts (by setting static
int timeout = -1 in the source)?

Also what kind of system it is? How fast is the CPU?

-- 
Cyril Hrubis
chrubis@suse.cz

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[LTP] 答复: [PATCH] Reduce loop count to meet need of low performance terminals

[徐飞飞(Steve) via ltp]

Are you sure that your kernel isn't affected by the bug the test checks for? The test timeouts on a buggy kernel.
-- Is there any place where I can see more relevant information? which kind of bug you have found?

the test timeout on myside where there still 640000 loop,
ZZL pid = 29466 this is while 646533 times loop = 646533 -------
ZZL pid = 29466 this is while 646532 times loop = 646532 -------
ZZL pid = 29466 this is while 646531 times loop = 646531 -------
ZZL pid = 29466 this is while 646530 times loop = 646530 -------
ZZL pid = 29466 this is while 646529 times loop = 646529 -------
ZZL pid = 29466 this is while 646528 times loop = 646528 -------
ZZL pid = 29466 this is while 646527 times loop = 646527 -------
ZZL pid = 29466 this is while 646526 times loop = 646526 -------
ZZL pid = 29466 this is while 646525 times loop = 646525 -------
ZZL pid = 29466 this is while 646524 times loop = 646524 -------
ZZL pid = 29466 this is while 646523 times loop = 646523 -------
ZZL pid = 29466 this is while 646522 times loop = 646522 -------
ZZL pid = 29466 this is while 646521 times loop = 646521 -------
Test timeouted, sending SIGKILL!
external/ltp/lib/tst_test.c:1641: TINFO: Killed the leftover descendant processes
external/ltp/lib/tst_test.c:1648: TINFO: If you are running on slow machine, try exporting LTP_TIMEOUT_MUL > 1
external/ltp/lib/tst_test.c:1649: TBROK: Test killed! (timeout?)

Summary:
passed   1
failed   0
broken   1
skipped  0
warnings 0


How long does the test run if you disable timeouts (by setting static int timeout = -1 in the source)?
-- about 370 seconds

Also what kind of system it is? How fast is the CPU?
--android 14 ,  kenrel 6.1.43-android14-11-o-g9bbfe9009b86 ,

cat /proc/cpuinfo
processor       : 0
BogoMIPS        : 38.40
Features        : fp asimd evtstrm aes pmull sha1 sha2 crc32 atomics fphp asimdhp cpuid asimdrdm lrcpc dcpop asimddp
CPU implementer : 0x41
CPU architecture: 8
CPU variant     : 0x2
CPU part        : 0xd05  （ARM_CPU_PART_CORTEX_A55)
CPU revision    : 0



cpu chip
-----邮件原件-----
发件人: Cyril Hrubis <chrubis@suse.cz>
发送时间: 2024年6月11日 19:41
收件人: 徐飞飞(Steve) <xufeifei1@oppo.com>
抄送: ltp@lists.linux.it
主题: Re: [LTP] [PATCH] Reduce loop count to meet need of low performance terminals

外部邮件/External Mail



Hi!
> --- a/runtest/sched
> +++ b/runtest/sched
> @@ -9,7 +9,7 @@ trace_sched01           trace_sched -c 1
>  cfs_bandwidth01 cfs_bandwidth01 -i 5
>  hackbench01 hackbench 50 process 1000
>  hackbench02 hackbench 20 thread 1000
> -starvation starvation
> +starvation starvation -l 100000

Are you sure that your kernel isn't affected by the bug the test checks for? The test timeouts on a buggy kernel.

How long does the test run if you disable timeouts (by setting static int timeout = -1 in the source)?

Also what kind of system it is? How fast is the CPU?

--
Cyril Hrubis
chrubis@suse.cz
________________________________
OPPO

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文化差异披露：因全球文化差异影响，单纯以YES\OK或其他简单词汇的回复并不构成发件人对任何交易或合同之正式确认或接受，请与发件人再次确认以获得明确书面意见。发件人不对任何受文化差异影响而导致故意或错误使用该等信息所造成的任何直接或间接损害承担责任。
This e-mail and its attachments contain confidential information from OPPO, which is intended only for the person or entity whose address is listed above. Any use of the information contained herein in any way (including, but not limited to, total or partial disclosure, reproduction, or dissemination) by persons other than the intended recipient(s) is prohibited. If you are not the intended recipient, please do not read, copy, distribute, or use this information. If you have received this transmission in error, please notify the sender immediately by reply e-mail and then delete this message.
Electronic communications may contain computer viruses or other defects inherently, may not be accurately and/or timely transmitted to other systems, or may be intercepted, modified ,delayed, deleted or interfered. OPPO shall not be liable for any damages that arise or may arise from such matter and reserves all rights in connection with the email.
Unless expressly stated, this e-mail and its attachments are provided without any warranty, acceptance or promise of any kind in any country or region, nor constitute a formal confirmation or acceptance of any transaction or contract. The sender, together with its affiliates or any shareholder, director, officer, employee or any other person of any such institution (hereinafter referred to as "sender" or "OPPO") does not waive any rights and shall not be liable for any damages that arise or may arise from the intentional or negligent use of such information.
Cultural Differences Disclosure: Due to global cultural differences, any reply with only YES\OK or other simple words does not constitute any confirmation or acceptance of any transaction or contract, please confirm with the sender again to ensure clear opinion in written form. The sender shall not be responsible for any direct or indirect damages resulting from the intentional or misuse of such information.

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Re: [LTP] 答复: [PATCH] Reduce loop count to meet need of low performance terminals

[Cyril Hrubis]

Hi!
> Are you sure that your kernel isn't affected by the bug the test checks for? The test timeouts on a buggy kernel.
> -- Is there any place where I can see more relevant information? which kind of bug you have found?

It's right in the top level comment in the testcase source where the
test description is.

> the test timeout on myside where there still 640000 loop,
> ZZL pid = 29466 this is while 646533 times loop = 646533 -------
> ZZL pid = 29466 this is while 646532 times loop = 646532 -------
> ZZL pid = 29466 this is while 646531 times loop = 646531 -------
> ZZL pid = 29466 this is while 646530 times loop = 646530 -------
> ZZL pid = 29466 this is while 646529 times loop = 646529 -------
> ZZL pid = 29466 this is while 646528 times loop = 646528 -------
> ZZL pid = 29466 this is while 646527 times loop = 646527 -------
> ZZL pid = 29466 this is while 646526 times loop = 646526 -------
> ZZL pid = 29466 this is while 646525 times loop = 646525 -------
> ZZL pid = 29466 this is while 646524 times loop = 646524 -------
> ZZL pid = 29466 this is while 646523 times loop = 646523 -------
> ZZL pid = 29466 this is while 646522 times loop = 646522 -------
> ZZL pid = 29466 this is while 646521 times loop = 646521 -------
> Test timeouted, sending SIGKILL!
> external/ltp/lib/tst_test.c:1641: TINFO: Killed the leftover descendant processes
> external/ltp/lib/tst_test.c:1648: TINFO: If you are running on slow machine, try exporting LTP_TIMEOUT_MUL > 1
> external/ltp/lib/tst_test.c:1649: TBROK: Test killed! (timeout?)
> 
> Summary:
> passed   1
> failed   0
> broken   1
> skipped  0
> warnings 0
> 
> 
> How long does the test run if you disable timeouts (by setting static int timeout = -1 in the source)?
> -- about 370 seconds

Looking at this it seems that your CPU is just a bit slower, if the test
fails it's supposed to be at least one order of magnitude slower.

> Also what kind of system it is? How fast is the CPU?
> --android 14 ,  kenrel 6.1.43-android14-11-o-g9bbfe9009b86 ,
> 
> cat /proc/cpuinfo
> processor       : 0
> BogoMIPS        : 38.40
> Features        : fp asimd evtstrm aes pmull sha1 sha2 crc32 atomics fphp asimdhp cpuid asimdrdm lrcpc dcpop asimddp
> CPU implementer : 0x41
> CPU architecture: 8
> CPU variant     : 0x2
> CPU part        : 0xd05  （ARM_CPU_PART_CORTEX_A55)
> CPU revision    : 0

So this is single core ARM cortex A55, it really seems to be just a case
of slower procesor, so it does make sense to lower the number of
iterations or increase the test timeout.

However the problem is that if we divide the default number of
iterations by two and keep the timeout the test would stil pass even on
broken kernel on an x86_64 desktop. So we probably need a callibration
loop that would be able to estimate the CPU speed to set the
expectations right.

-- 
Cyril Hrubis
chrubis@suse.cz

-- 
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