[Beowulf] stace_analyzer.pl can't work.

Eric.L eric.l.2046 at gmail.com
Wed Sep 17 21:18:15 PDT 2008


2008/9/16 Joe Landman <landman at scalableinformatics.com>

> Jeff Layton wrote:
>
>>
>> I've never used Mercurial or any other "real" programming tool for
>> tracking changes, but go for it! It forces me to learn it.
>>
>
> Common ones these days are Mercurial and git.  I prefer the former, it is
> understandable by mere mortals.
>
>  I like the idea of a DB, but I'm a bit worried that this will get out of
>> hand. It's a simple tool to do a quick analysis (although I have bigger
>> plans in mind). I haven't looked at SQLite in a few years. Is it still an
>> in-memory DB or does it allow you to dump the DB to a file (or two).
>>
>
> On disk very simple database.  Nothing even remotely complex about it.
> Slowly (and surely) many projects that have been using bdb (or more
> correctly *db) are migrating to it.  We have been using it for a while for
> lots of little things.  Works quite well, painless to set up (you don't).
>
>
>> BTW - thanks for the patch. I like the second option of ignoring any
>> return codes that are negative. Easy change.
>>
>
> should read
>
>        ...  if ($junk < 0);
>

I applyed that but got the error:
Argument "" isn't numeric in numeric lt (<) at ./strace_analyzer.pl line
310, <> line 64377.

So I modifiy the line:310 as following:

$ReadBytesTotal += $junk if ($junk ne "" && $junk < 0);

It works but there is a question:
Is it normal that $junk 's value is ""?


>
>
>
>> Thanks!
>>
>> Jeff
>>
>>
>> ----- Original Message ----
>> From: Joe Landman <landman at scalableinformatics.com>
>> To: Jeff Layton <laytonjb at att.net>
>> Cc: Mark Hahn <hahn at mcmaster.ca>; Eric.L <eric.l.2046 at gmail.com>;
>> beowulf at beowulf.org
>> Sent: Tuesday, September 16, 2008 8:13:10 AM
>> Subject: Re: [Beowulf] stace_analyzer.pl can't work.
>>
>> A quick patchy-patchy for 310
>>
>>
>>
>> --- strace_analyzer.pl <http://strace_analyzer.pl>    2008-09-16
>> 07:57:34.000000000 -0400
>> +++ strace_analyzer_new.pl <http://strace_analyzer_new.pl>    2008-09-16
>> 08:01:45.000000000 -0400
>>
>> @@ -307,7 +307,7 @@
>>            $junk =~ s/[^0-9]//g;
>>
>>            # Keep track of total number bytes read
>> -          $ReadBytesTotal += $junk;
>> +          $ReadBytesTotal += $junk if ($junk != -1);
>>
>>            # Clean up write unit
>>            ($junk1, $junk2)=split(/\,/,$cmd_unit);
>>
>>
>> There may be other error return codes which are negative, so if you want
>> to filter those as well, use "(if $junk < 0)" rather than the above.
>>
>> As for the rest of the code structure, writing this parser isn't all
>> that hard, and for those with smaller memories but bigger disks (and a
>> desired to analyze large straces), we could use the DBIx::SimplePerl
>> module.  Jeff is already putting his arrays together as hashes, and that
>> module makes it real easy to dump a hash data structure directly into a
>> database, say a SQLite3 database.  Which, curiously, could make a bit of
>> the code easier to deal with/write/debug.
>>
>> The issue you have to worry about in dealing with huge streams of data,
>> is running out of ram.  This happens.  Many "common" techniques fail
>> when data gets very large (compared to something like ram).  We had to
>> solve a large upload/download problem for a customer who decided to use
>> a web server for multi gigabyte file upload/download form in an
>> application.  The common solution was to pull everything in to ram and
>> massage it from there.  This failed rather quickly.
>>
>> I don't personally have large amounts of "free" time, but I could likely
>> help out a bit with this.  Jeff, do you want me to create something on
>> our mercurial server for this?  Or do you have it in SVN/CVS somewhere?
>>
>> Joe
>>
>>
>> --
>> Joseph Landman, Ph.D
>> Founder and CEO
>> Scalable Informatics LLC,
>> email: landman at scalableinformatics.com <mailto:
>> landman at scalableinformatics.com>
>> web  : http://www.scalableinformatics.com
>>        http://jackrabbit.scalableinformatics.com
>> phone: +1 734 786 8423 x121
>> fax  : +1 866 888 3112
>> cell : +1 734 612 4615
>>
>
>
> --
> Joseph Landman, Ph.D
> Founder and CEO
> Scalable Informatics LLC,
> email: landman at scalableinformatics.com
> web  : http://www.scalableinformatics.com
>       http://jackrabbit.scalableinformatics.com
> phone: +1 734 786 8423 x121
> fax  : +1 866 888 3112
> cell : +1 734 612 4615
>
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