I am very curious about the oft quoted 5000 worker thread limit for varnish instances. Particularly:
1) Is this recommendation still best practice despite having been made years ago? Is it still relevant for -- now readily available -- beefier server configurations like 16 or 32 cpu monsters with hundreds of GB RAM and 10gb ethernet? Part of the original recommendation mentions bumping up against file descriptor limits, but a cr1.8xlarge ec2 cluster instance allows over 20m open file descriptors. 2) Is it the recommended limit for a single varnish instance, or a recommended limit machine-wide. For instance, if I'm running 5 varnishd instances on a single host, can each instance safely flex up to 5000 worker threads concurrently or should the sum of worker threads across all instances not exceed 5000? Very interested to hear -- thanks! Johnny
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