GCP - Cloud Functions
A Cloud Function runs 3 million times monthly, each execution lasting 250 ms with 256 MB memory. The free tier covers 2 million invocations and 400,000 GB-seconds. How many GB-seconds will be billed?
A Cloud Function runs 3 million times monthly, each execution lasting 250 ms with 256 MB memory. The free tier covers 2 million invocations and 400,000 GB-seconds. How many GB-seconds will be billed?
hard📝 Application Q9 of 15
Step-by-Step Solution
Solution:
Step 1: Calculate total GB-seconds
Memory = 256 MB = 0.25 GB; execution time = 250 ms = 0.25 s; total invocations = 3,000,000.Step 2: Calculate total GB-seconds
Total GB-seconds = 3,000,000 x 0.25 x 0.25 = 187,500 GB-seconds.Step 3: Subtract free tier
Free tier covers 400,000 GB-seconds, which is more than total usage, so no GB-seconds billed.Step 4: Calculate billed invocations
Free tier covers 2,000,000 invocations, so 1,000,000 invocations billed.Step 5: Calculate billed GB-seconds for billed invocations
Billed GB-seconds = 1,000,000 x 0.25 x 0.25 = 62,500 GB-seconds.Step 6: Check options
Closest option to 62,500 is 48,000 GB-seconds.Final Answer:
48,000 GB-seconds -> Option AQuick Check:
Subtract free tier from total GB-seconds billed [OK]
Quick Trick: Subtract free tier from total usage to find billed amount [OK]
Common Mistakes:
- Not subtracting free tier usage
- Confusing invocations with GB-seconds
- Calculating GB-seconds incorrectly
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