You can use Parallel::ForkManager to parallelize HTTP::MHTTP or HTTP::GHTTP calls easily and apply a limit to the maximum number of child processes.

There are a number of ways to handle getting the retrieved data back to the parent or other process that don't require use of shared memory:

• use MLDBM::Sync
• use Cache::Cache (specifically Cache::FileCache)
• use database that runs as a daemon (e.g. MySQL or PostgresQL).

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