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Stuff The Internet Says On Scalability For December 7th, 2018

High Scalability

It's HighScalability time: This is your 1500ms latency in real life situations - pic.twitter.com/guot8khIPX. — Ivo Mägi (@ivomagi) November 27, 2018. Do you like this sort of Stuff? Please support me on Patreon. I'd really appreciate it. Know anyone looking for a simple book explaining the cloud?

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USENIX LISA2021 Computing Performance: On the Horizon

Brendan Gregg

## References I've reproduced the talk references below, so you can click on links: - [Gregg 08] Brendan Gregg, “ZFS L2ARC,” [link] Jul 2008 - [Gregg 10] Brendan Gregg, “Visualizations for Performance Analysis (and More),” [link] 2010 - [Greenberg 11] Marc Greenberg, “DDR4: Double the speed, double the latency? Ford, et al., “TCP

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bpftrace (DTrace 2.0) for Linux 2018

Brendan Gregg

Screenshot: tracing read latency for PID 181: # bpftrace -e 'kprobe:vfs_read /pid == 30153/ { @start[tid] = nsecs; } kretprobe:vfs_read /@start[tid]/ { @ns = hist(nsecs - @start[tid]); delete(@start[tid]); }'. Here's key differences as of August 2018: Type DTrace bpftrace. It's shaping up to be a DTrace version 2.0: I wrote seeksize.d

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USENIX LISA2021 Computing Performance: On the Horizon

Brendan Gregg

## References I've reproduced the talk references below, so you can click on links: - [Gregg 08] Brendan Gregg, “ZFS L2ARC,” [link] Jul 2008 - [Gregg 10] Brendan Gregg, “Visualizations for Performance Analysis (and More),” [link] 2010 - [Greenberg 11] Marc Greenberg, “DDR4: Double the speed, double the latency? Ford, et al., “TCP

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New Year’s Updates

John McCalpin

As part of my attempt to become organized in 2019, I found several draft blog entries that had never been completed and made public. January 2018: A Peculiar Throughput Limitation in the Intel Xeon Phi x200 (Knights Landing) Processor. December 2013: Notes on Memory Bandwidth on the Xeon Phi (Knights Corner) Coprocessor.

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How to use Server Timing to get backend transparency from your CDN

Speed Curve

Charlie Vazac introduced server timing in a Performance Calendar post circa 2018. Latency – How much time does it take to deliver a packet from A to B. Here are a couple of great blog posts from last year's Web Performance Calendar. In practice, it looks something like this: server-timing: processing_time; dur=123.4;

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bpftrace (DTrace 2.0) for Linux 2018

Brendan Gregg

Screenshot: tracing read latency for PID 181: # bpftrace -e 'kprobe:vfs_read /pid == 30153/ { @start[tid] = nsecs; } kretprobe:vfs_read /@start[tid]/ { @ns = hist(nsecs - @start[tid]); delete(@start[tid]); }'. Here's key differences as of August 2018: Type DTrace bpftrace. It's shaping up to be a DTrace version 2.0: I wrote seeksize.d

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