Brendan Gregg

MARCH 16, 2024

This technique saves two instructions in the prologue and epilogue and makes one additional general-purpose register (%rbp) available." Only in extreme circumstances does the cost (in processor time and I-cache footprint) translate to a tangible benefit - circumstances which usually resort to hand-coded assembly anyway.

Java 145

Java Cache Google Hardware 145

Brendan Gregg

AUGUST 29, 2021

Reads usually have apps waiting on them; writes may not (write-back caching). total used free shared buff/cache available Mem: 64414 15421 349 5 48643 48409 Swap: 0 0 0. There's not much memory left, 349 Mbytes, but more interesting is the amount in the buffer/page cache: 48,643 Mbytes (48 Gbytes). This is "cache busting."

Cache 105

Cache C++ AWS Latency 105

SQL Performance

MAY 16, 2019

If both sort and no-sort alternatives are available, the optimizer will make a cost-based choice. For SQL Server 2014 and later, the uniquifier is correctly omitted for unique indexes, but the one extra byte for the internal bit flag is retained. Test ; END ; GO. spt_values AS SV ; Plan Caching. DMLRequestSort Conditions.

Cache 67

Cache Servers Testing Storage 67

Alex Russell

APRIL 29, 2021

This post mines publicly available data on the pace of compatibility fixes and feature additions to assess the claim. Thanks to the Web Platform Tests project and wpt.fyi , we have the makings of an answer for the first: Tests that fail only in a given browser. Count of APIs available from JavaScript by Web Confluence.

Media 145

Media Games Education Engineering 145

Brendan Gregg

AUGUST 29, 2021

Reads usually have apps waiting on them; writes may not (write-back caching). This is a 64-Gbyte memory system, and 48 Gbytes is in the page cache (the file system cache). Along with the numbers from the problem statement, this gives me a theory: Do the 100-Gbyte files bust the page cache, whereas 40-Gbyte files fit?

Cache 40

Cache C++ AWS Systems 40

The Morning Paper

JANUARY 23, 2020

Today we’ll be digging into the analysis of an incident that took place at Etsy on December 4th, 2014. The shop had been closed so no data was available. During incident management, prefer peer review of any code changes to gain confidence as opposed to automated tests or other procedures. " – wikipedia.

Internet 53

Internet Internet Cache Engineering 53

Alex Russell

MARCH 6, 2021

A then-representative $200USD device had 4-8 slow (in-order, low-cache) cores, ~2GiB of RAM, and relatively slow MLC NAND flash storage. Modern network performance and availability. mid-priced Androids were slightly faster than 2014's iPhone 6. The Moto G4 , for example. Here begins our 2021 adventure. Hard Reset.

Performance 124

Performance Network Cache Metrics 124