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Brendan Gregg

What Brendan Gregg thinks about software performance

@brendan-gregg · 17 positions · On ppll ↗

Computer performance engineer working on datacenter performance at OpenAI, previously Netflix and Sun/Joyent. Author of Systems Performance and BPF Performance Tools, and creator of flame graphs.

Brendan Gregg did not write this page.

We collected these quotes from things they published elsewhere, and every quote links to where it was said. They have no account here and have not endorsed this site. Quotes are word for word; the short line under each one is our own restatement, not their wording. Their own site. Is this you? Claim it or ask us to remove it. Or tell us what is wrong here.

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Only Brendan Gregg on software performance. See everyone on software performance

4 dated positions, 2025, in their own words. Our reading of what Brendan Gregg has said — not written or endorsed by them.

4 positions so far — this page is not yet offered to search engines.

  1. Our readingRelying on AI to replace performance engineers reduces an organization's overall technical expertise over time.

    Their wordsIf a company spends less on performance engineers as it's considered AI'd, it will reduce the company's effective "performance IQ."

    ↗On "AI Brendans" or "Virtual Brendans"brendangregg.com 2nd of 3 in this piece

  2. 11 days earlier

  3. Our readingComputer hardware performance depends on hardware, software, and tuning together, not hardware alone.

    Their wordsYou need all three stages to reach the highest, and most competitive, performance.

    ↗Third Stage Engineeringbrendangregg.com 1st of 2 in this piece

  4. 3 months earlier

  5. Our readingMonitoring tools that do periodic work can themselves cause the latency outliers they were installed to diagnose.

    Their wordsOne performance anti-pattern is when a company, to debug one performance problem, installs a monitoring tool that periodically does work and causes application latency outliers.

    ↗When to Hire a Computer Performance Engineering Team (2025) part 1 of 2brendangregg.com 2nd of 3 in this piece

  7. Our readingA performance test without an explanation of its limiting factor should be treated as unanalyzed and possibly bogus.

    Their wordsAny performance test should be accompanied by an explanation of the limiting factor, since no explanation will reveal the test wasn't analyzed and the result may be bogus.

    ↗When to Hire a Computer Performance Engineering Team (2025) part 1 of 2brendangregg.com 3rd of 3 in this piece