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Full Discussion: My script seems to eat too much memory
Top Forums Shell Programming and Scripting My script seems to eat too much memory Post 302962915 by anominous on Sunday 20th of December 2015 10:34:54 PM
Old 12-20-2015
I believe I fixed the memory problems now. I grab PIDs of background processes, so I can wait if too many of them are running. A https cURL needs like 7 MB on my machine. When hundreds of them are running, they can consume gigabytes.

Before the background job code:
Code:
# wait if too many crawl jobs running
if [ ${#crawl_jobs[@]} -ge $max_crawl_jobs ]; then
  wait "${crawl_jobs[$crawl_index]}"
  unset -v crawl_jobs[$((crawl_index++))]
fi

# wait if too many download processes
if [ $max_downloads -gt 0 ]; then
  while [ $(ps -fu $USER | grep curl.*4cdn | wc -l) -ge $max_downloads ]; do
    sleep 1
  done
fi

After the background job code:
Code:
# save current crawl job's process ID in an array
crawl_jobs+=("$!")

It's a pity that, seemingly, we have a wait command but no tool to count all background jobs.

Your debug code seems like a good idea. I will have a closer look into this, thanks!
 

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LEARN ABOUT SUNOS

script

script(1)							   User Commands							 script(1)

NAME

       script - make record of a terminal session

SYNOPSIS

       script [-a] [filename]

DESCRIPTION

       The  script  utility  makes a record of everything printed on your screen. The record is written to filename. If no file name is given, the
       record is saved in the file typescript. See WARNINGS.

       The script command forks and creates a sub-shell, according to the value of $SHELL, and records the text from this session. The script ends
       when the forked shell exits or when Control-d is typed.

OPTIONS

       The following option is supported:

       -a	Appends the session record to filename, rather than overwriting it.

NOTES

       script places everything that appears on the screen in filename, including prompts.

ATTRIBUTES

       See attributes(5) for descriptions of the following attributes:

       +-----------------------------+-----------------------------+
       |      ATTRIBUTE TYPE	     |	    ATTRIBUTE VALUE	   |
       +-----------------------------+-----------------------------+
       |Availability		     |SUNWcsu			   |
       +-----------------------------+-----------------------------+
       |CSI			     |Enabled			   |
       +-----------------------------+-----------------------------+

SEE ALSO

       attributes(5)

WARNINGS

       script  can  pose  a  security risk when used in directories that are writable by other users (for example, /tmp), especially when run by a
       privileged user, that is, root. Be sure that typescript is not a link before running script.

SunOS 5.10							    30 Jan 2004 							 script(1)
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