Frontend Instance Hours vs CPU Minutes

[anatoly techtonik]

I know there is a lot of info about it, but seems too much for me, so I have to ask.

Given:

My app uses 24 Frontend Instance Hours (FIH) out of 28 allowed by free quota.

My app is a cron job that pings external site every minute and stores result in DB.

FIH in Dashboard are calculated since 0:00 PST (that's ~2 hours ago).

After 95 minutes since Dashboard I had 0.60 FIH out of 28.

95 minutes is 95 requests in my application.

Each request something like ms=128 cpu_ms=138 api_cpu_ms=115 cpm_usd=0.005744

95 requests *  0.006 cpm_used = 0.57 CPU minutes used

But 0.60 of 1 Front Instance Hour are 36 Frontend Instance Minutes

Question:

What are Frontend Instance Minutes and why they are so different from CPU Minutes?

[Barry Hunter]

CPU Minutes, will be time the processor is actully active.

Instance Minutes are used - while the instance is alive - even if actully idle.

Your instance will be idle in-between cron invocations. But not long
enough for the instance to be shutdown.

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