Hi Olga,
Sorry for the delay in responding.
Is Roger sponsoring this along with your others? Or should this go on
the 'awaiting sponsor' list?
Thanks.
Bonnie
On 02/ 8/10 07:04 PM, ????? ???????????? wrote:
> Please add this bug to my sponsor requests:
> BUG ID: 6920072
> BUG Synopsis: ksh93 tail -f, with unconditional .25s sleep and line
> parsing, about 37x slower than cat
>
> 2009/12/9 ????? ???????????? <olga.kryzhanovska at gmail.com>:
>> This is a request for sponsors for fixing the following list of bugs:
>>
>> BUG ID: 6904557
>> BUG Synopsis: wc no longer counts number of bytes correctly
>>
>> BUG ID: 6904575
>> BUG Synopsis: cut -d with multibyte character no longer works
>>
>> BUG ID: 6904597
>> BUG Synopsis: paste -d no longer works with multibyte characters
>>
>> BUG ID: 6904780
>> BUG Synopsis: usr/bin/chksum changed output in snv_128
>>
>> BUG ID: 6904870
>> BUG Synopsis: uniq -s does not skip multibyte characters correctly
>>
>> BUG ID: 6904878
>> BUG Synopsis: join -t no longer works with multibyte char separator
>>
>>
>> The same patch will fix the the P1 STOPPER bug:
>> BUG ID: 6900314
>> BUG Synopsis: (while true ; do true | true ; done) hang in ioctl() with
>> SIGTTOU
>>
>>
>> Name: Olga Kryzhanovska
>> Opensolaris user name: fleyta
>> SCA ID: #OS0402
>> --
>> , _ _ ,
>> { \/`o;====- Olga Kryzhanovska -====;o`\/ }
>> .----'-/`-/ olga.kryzhanovska at gmail.com \-`\-'----.
>> `'-..-| / Solaris/BSD//C/C++ programmer \ |-..-'`
>> /\/\ /\/\
>> `--` `--`
>>
>
>
>
>
>
> ---------- Forwarded message ----------
> From: <bugmail-sender at sun.com>
> Date: Tue, Jan 26, 2010 at 8:21 AM
> Subject: [ksh93-integration-discuss] CR 6920072 Updated, P3
> utility/text ksh93 tail -f, with unconditional .25s sleep and line
> parsing, about 37x slower than cat
> To:
>
>
> *Synopsis*: ksh93 tail -f, with unconditional .25s sleep and line
> parsing, about 37x slower than cat
>
> CR 6920072 changed on Jan 26 2010 by <User 1-5Q-1267>
>
> === Field ============ === New Value ============= === Old Value =============
>
> See Also 6790507
> ====================== =========================== ===========================
>
>
> *Change Request ID*: 6920072
>
> *Synopsis*: ksh93 tail -f, with unconditional .25s sleep and line
> parsing, about 37x slower than cat
>
> Product: solaris
> Category: utility
> Subcategory: text
> Type: Defect
> Subtype:
> Status: 1-Dispatched
> Substatus:
> Priority: 3-Medium
> Introduced In Release:
> Introduced In Build:
> Responsible Engineer:
> Keywords:
>
> === *Description* ============================================================
> Running tail -f on a nightly.log during a build on an Opensolaris
> snv_126 machine,
> I noticed that the tail was running long after the build had
> completed. The first
> time I killed it; the second time I decided to let it run. *26
> minutes* after the
> build completed, it finally completed (the entire build had only taken
> 28 minutes).
>
> Now, this was across an ssh connection from EGO02 to MPK17, but I took the
> same
> log file and did several tests:
>
> tail -f: 26:XX
> nfs cp: 00:29
> scp: 00:29
> scp -C: 00:36
> cat: 00:42
>
> That's quite a difference.
>
> Trussing the command, I see that it's ksh93, and that ksh is apparently
> reading
> line-chunked things of approximately 8K, and writing line-chunked blocks to
> the
> output, and unconditionally delaying .25s between each stat/read/write call.
> That latter, in particular, seems to be the biggest problem, and seems
> ill-advised;
> if there's to be a delay, it seems like "stat, and if no change sleep and then
> stat again" would be a lot more efficient.
>
> Also, for -f, I don't see why there's any point in doing the
> line-oriented calls;
> original tail didn't, and I can't imagine it's a win.
>
> *** (#1 of 1): 2010-01-26 04:51:29 GMT+00:00 <User 1-5Q-12546>
>
>
> === *Public Comments* ========================================================
>
> === *Workaround* =============================================================
>
> === *Additional Details* =====================================================
> Targeted Release:
> Commit To Fix In Build:
> Fixed In Build:
> Integrated In Build:
> Verified In Build:
> See Also: 6790507
> Duplicate of:
> Hooks:
> Hook1:
> Hook2:
> Hook3:
> Hook4:
> Hook5:
> Hook6:
> Program Management:
> Root Cause:
> Fix Affects Documentation: No
> Fix Affects Localization: No
>
> === *History* ================================================================
> Date Submitted: 2010-01-26 04:51:29 GMT+00:00
> Submitted By: <User 1-5Q-12546>
>
> Status Changed Date Updated Updated By
>
>
> === *Service Request* ========================================================
> Impact: Significant
> Functionality: Secondary
> Severity: 3
> Product Name: solaris
> Product Release: solaris_nevada
> Product Build:
> Operating System: snv_126
> Hardware: generic
> Submitted Date: 2010-01-26 04:51:30 GMT+00:00
>
>
> === *Multiple Release (MR) Cluster* - 0 ======================================
>
> _______________________________________________
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>
>
>
