System Throughput
System throughput is the amount of work a system can process within a specified period under defined operating conditions.
“The amount of data passing through a component or system in a given time period.”
(Definition reproduced from the ISTQB Glossary. Copyright belongs to ISTQB.)
View the complete ISTQB GlossaryWhat is System Throughput?
Throughput is commonly measured as transactions, requests, or operations completed per second, minute, or hour.
Performance metric: Measures processing capacity.
Workload dependent: Varies with system load and resources.
Performance evaluation: Used during capacity and performance testing.
Real World Example
A video streaming platform wants to know whether its transcoding pipeline can keep up with a planned increase in daily video uploads.
Dashboards show healthy average response times for individual API calls, but nobody is measuring how much video data the pipeline actually processes per hour end to end — response time per call says nothing about whether the pipeline can sustain the real data volume expected.
The tester measures System throughput directly: gigabytes of video processed per hour through the full transcoding pipeline at a realistic mix of resolutions and lengths, tracking how that number changes as concurrent uploads increase.
Measuring System throughput reveals the pipeline sustains only 40GB/hour before queuing delays compound, well below the 65GB/hour the planned increase will require — a capacity gap that individual API response-time metrics never would have surfaced on their own.
Practice Questions
Question 1
A video platform's dashboards show healthy average API response times, but nobody has measured how many gigabytes of video the transcoding pipeline actually processes per hour under realistic load. What metric is missing?
Question 2
Which measurement MOST directly evaluates system throughput for a file-processing service?
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