pawan68923,

...only thing they need to share (read and write both) using file is - how many processes of one type are in execution...

I would have the the parent keep these counters in memory. From your description the parent starts the processes and maintain the counts. Why use a file?

Some things to consider:

• Test your theory. That many CPUs may act different than you (or I) might think. I have many times assumed a solution to find that it didn't scale well. You could have dependencies that you don't even know exist.
• Always lock even it's "read only". 'flock' is trivial compared to the time fixing a solution that now will "read and write" only one thing.

Sounds like a massive undertaking -- should be fun!

Good Luck!

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