GCP Professional Cloud Architect Practice Question
A financial-services firm runs Monte Carlo risk simulations each night between 23:00 and 07:00. The workloads are containerized, stateless, and automatically retry failed tasks. Peak demand is 1,000 vCPUs for roughly three hours; the remaining time demand is negligible. Leadership wants the lowest possible compute cost without extending the job's completion deadline. Which approach best satisfies the requirement?
Schedule daily startup and shutdown of 100 N2 standard VMs purchased under a 3-year committed use discount to cover the peak period.
Deploy the containers to Cloud Run and configure a minimum of 1,000 always-on instances to avoid cold-start latency overnight.
Create a GKE Standard cluster with a node pool that uses Spot VMs and enable the Cluster Autoscaler to scale up to 1,000 vCPUs during the simulation window.
Reserve a sole-tenant N2 node group sized for 1,000 vCPUs and purchase a 1-year Compute Engine committed use discount.
Spot VMs cost up to 91 % less than standard VMs because Google Cloud can reclaim the capacity at any time. They are therefore recommended only for workloads that tolerate interruptions and can resume or retry, such as batch analytics or CI/CD pipelines. Creating a GKE node pool backed by Spot VMs and enabling the Cluster Autoscaler allows the nightly job to scale to 1,000 vCPUs when needed and shrink to zero afterwards, delivering the greatest savings. Cloud Run with 1,000 pinned instances and sole-tenant nodes both incur much higher fixed cost, while 3-year committed-use VMs still charge 24×7 even though they run only 8 h per day.
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What are Spot VMs in Google Cloud?
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How does GKE Cluster Autoscaler work?
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Why is Cloud Run with pinned instances not cost-effective for this workload?
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What are Spot VMs in Google Cloud?
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How does GKE Cluster Autoscaler work?
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Why is Cloud Run with 1,000 pinned instances not cost-effective for this workload?
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GCP Professional Cloud Architect
Designing and planning a cloud solution architecture
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