December 2019
Intermediate to advanced
880 pages
28h 2m
English
Content preview from BPF Performance Tools
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O’Reilly covers everything we've got, with content to help us build a world-class technology community, upgrade the capabilities and competencies of our teams, and improve overall team performance as well as their engagement.I wanted to learn C and C++, but it didn't click for me until I picked up an O'Reilly book. When I went on the O’Reilly platform, I was astonished to find all the books there, plus live events and sandboxes so you could play around with the technology.I’ve been on the O’Reilly platform for more than eight years. I use a couple of learning platforms, but I'm on O'Reilly more than anybody else. When you're there, you start learning. I'm never disappointed.I'm always learning. So when I got on to O'Reilly, I was like a kid in a candy store. There are playlists. There are answers. There's on-demand training. It's worth its weight in gold, in terms of what it allows me to do.
Chapter 5. bpftrace
bpftrace is an open source tracer built on BPF and BCC. Like BCC, bpftrace ships with many performance tools and supporting documentation. However, it also provides a high-level programming language that allows you to create powerful one-liners and short tools. For example, summarizing the vfs_read() return value (bytes or error value) as a histogram using bpftrace one-liner:
# bpftrace -e 'kretprobe:vfs_read { @bytes = hist(retval); }' Attaching 1 probe... ^C @bytes: (..., 0) 223 |@@@@@@@@@@@@@ | [0] 110 |@@@@@@ | [1] 581 |@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@ | [2, 4) 23 |@ | [4, 8) 9 | | [8, 16) 844 |@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@| [16, 32) 44 |@@ | [32, 64) 67 |@@@@ | ...Become an O’Reilly member and get unlimited access to this title plus top books and audiobooks from O’Reilly and nearly 200 top publishers, thousands of courses curated by job role, 150+ live events each month,
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O’Reilly covers everything we've got, with content to help us build a world-class technology community, upgrade the capabilities and competencies of our teams, and improve overall team performance as well as their engagement.Julian F.
I wanted to learn C and C++, but it didn't click for me until I picked up an O'Reilly book. When I went on the O’Reilly platform, I was astonished to find all the books there, plus live events and sandboxes so you could play around with the technology.Addison B.
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I'm always learning. So when I got on to O'Reilly, I was like a kid in a candy store. There are playlists. There are answers. There's on-demand training. It's worth its weight in gold, in terms of what it allows me to do.