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The Speed of Time

Brendan Gregg

This server is spending about a third of its CPU cycles just checking the time! As a Xen guest, this profile was gathered using perf(1) and the kernel's software cpu-clock soft interrupts, not the hardware NMI. Colleagues/Internet I love using [Linux performance tools]. 30.14% in the middle of the flame graph.

Speed 126
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Why speed test results are different than your load times

MachMetrics

You run a speed test on a website, and the results don’t match what you personally experience. Perhaps you feel like your site loads fairly quickly, but the speed test results are sub-optimal. We wanted to have control of the hardware that runs our tests and deliver consistent results. Is your website getting slower?

Speed 62
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What is Greenplum Database? Intro to the Big Data Database

Scalegrid

It can scale towards a multi-petabyte level data workload without a single issue, and it allows access to a cluster of powerful servers that will work together within a single SQL interface where you can view all of the data. What Exactly is Greenplum? At a glance – TLDR. The Greenplum Architecture. Greenplum Architectural Design.

Big Data 321
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USENIX LISA2021 Computing Performance: On the Horizon

Brendan Gregg

I summarized these topics and more as a plenary conference talk, including my own predictions (as a senior performance engineer) for the future of computing performance, with a focus on back-end servers. This was a chance to talk about other things I've been working on, such as the present and future of hardware performance.

article thumbnail

The Speed of Time

Brendan Gregg

This server is spending about a third of its CPU cycles just checking the time! As a Xen guest, this profile was gathered using perf(1) and the kernel's software cpu-clock soft interrupts, not the hardware NMI. Colleagues/Internet I love using Linux performance tools. 30.14% in the middle of the flame graph.

Speed 52
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Time to First Byte: What It Is and Why It Matters

CSS Wizardry

A lot of people surmise that TTFB is merely time spent on the server, but that is only a small fraction of the true extent of things. TTFB isn’t just time spent on the server, it is also the time spent getting from our device to the sever and back again (carrying, that’s right, the first byte of data!). Expect closer to 75ms.

Latency 269
article thumbnail

The Speed of Time

Brendan Gregg

This server is spending about a third of its CPU cycles just checking the time! As a Xen guest, this profile was gathered using perf(1) and the kernel's software cpu-clock soft interrupts, not the hardware NMI. Colleagues/Internet I love using [Linux performance tools]. 30.14% in the middle of the flame graph.

Speed 40