Skip to content

Instantly share code, notes, and snippets.

View daverigby's full-sized avatar

Dave Rigby daverigby

30 followers · 4 following
View GitHub Profile
@GitMensch
GitMensch / perf4gitpod.sh
Last active June 19, 2024 12:30
# see https://github.com/gitpod-io/gitpod/issues/8893
sudo apt install -y bison flex libelf-dev libnewt-dev libdw-dev libaudit-dev libiberty-dev libunwind-dev libcap-dev libzstd-dev libnuma-dev libssl-dev python3-dev python3-setuptools binutils-dev gcc-multilib liblzma-dev systemtap-sdt-dev
# you _may_ need asciidoc, too; that's quite a big one
cd /workspace
git clone --depth 1 --filter=blob:none --sparse git://git.kernel.org/pub/scm/linux/kernel/git/acme/linux.git
cd linux
git sparse-checkout set dir tools scripts
git fetch --depth 1 origin v5.15
make -C tools/perf
@daverigby
daverigby / Profiling memcached.md
Last active March 2, 2023 11:48

Step 1 - Gather profile

  1. Install debuginfo package (in addition to main RPM/deb)
  2. Install linux perf tools:
    • RHEL / CentOS / Amazon Linux: yum install perf.
    • Note: CentOS7 has a pretty old version of perf; which includes some issues decoding backtraces via DWARF. Prefer a newer version if possible. I have a local build of 5.11 for CentOS7 at ~/Documents/linux-perf-5.11-with-separate_debuginfo_unwind_fix
  3. Start workload to be measured
  4. Record profile
    1. x86-64:
@daverigby
daverigby / GDB pretty printing of C++ STL.md
Last active September 25, 2025 01:33
  1. Install package libstdc++6 (Ubuntu 16.04)
  2. Add following to ~/.gdbinit
python
import sys 
sys.path.insert(0, '/usr/share/gcc-9/python')
from libstdcxx.v6.printers import register_libstdcxx_printers
register_libstdcxx_printers (None)
end
@bcantrill
bcantrill / cornellcs.txt
Created December 13, 2012 18:29
An old e-mail to the Cornell CS faculty; have things changed in the last 12 years?
From bmc Mon Oct 2 15:12:34 2000
Subject: Undergrad systems curriculum
To: [email protected]
Date: Mon, 2 Oct 2000 15:12:34 -0700 (PDT)
X-Mailer: ELM [version 2.4ME+ PL31H (25)]
MIME-Version: 1.0
Content-Type: text/plain; charset=US-ASCII
Content-Transfer-Encoding: 7bit
Content-Length: 4065
Status: RO
@skyscribe
skyscribe / .gdbinit
Created October 30, 2012 03:04
GDB init file to print STL containers and data members
#
# STL GDB evaluators/views/utilities - 1.03
#
# The new GDB commands:
# are entirely non instrumental
# do not depend on any "inline"(s) - e.g. size(), [], etc
# are extremely tolerant to debugger settings
#
# This file should be "included" in .gdbinit as following:
# source stl-views.gdb or just paste it into your .gdbinit file