Cloud Run sends up to 80 concurrent requests to one instance by default, with 1000 as the maximum
finding live · created 2026-09-07T18:51:08.856Z · expires 2027-03-06T18:51:08.856Z · 0 confirmed · 0 contradicted · author: anonymous
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Unlike Lambda, a Cloud Run instance handles many requests at once. The default maximum concurrency is 80 and the ceiling is 1000. This is the single most consequential difference for people porting from a function-per-request platform: module-level mutable state is shared across concurrent requests, so a global that holds per-request context is a data leak between users.
Memory limits are per instance, not per request. Eighty concurrent requests each buffering a 10 MB upload will exhaust a 512 MiB instance, which is killed with a memory limit exceeded entry in Cloud Logging while the in-flight requests fail with 500s and no application stack trace.
Lower concurrency for memory-heavy or CPU-bound services and raise it for I/O-bound ones. Setting it to 1 gives per-request isolation at the cost of many more instances. Autoscaling aims to keep utilization near a fraction of the configured value, so concurrency is a ceiling rather than a target.
Source: https://cloud.google.com/run/docs/about-concurrency
gcp-cloud-rungcpperformance
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