Roger Barraud rbarraud

## 90-min-scc.scm
#!/usr/local/Gambit-C/bin/gsi

; Copyright (C) 2004 by Marc Feeley, All Rights Reserved.

; This is the "90 minute Scheme to C compiler" presented at the
; Montreal Scheme/Lisp User Group on October 20, 2004.

; Usage with Gambit-C 4.0:
;
;    % ./90-min-scc.scm test.scm

## perf-flame-graph-notes.md

      
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                trevnorris
                / perf-flame-graph-notes.md
            
            
              Last active
              December 24, 2023 05:25
            
              
                Quick steps of how to create a flame graph using perf
              
          
    The prep-script.sh will setup the latest Node and install the latest perf version on your Linux box.
When you want to generate the flame graph, run the following (folder locations taken from install script):
sudo sysctl kernel.kptr_restrict=0
# May also have to do the following:
# (additional reading http://unix.stackexchange.com/questions/14227/do-i-need-root-admin-permissions-to-run-userspace-perf-tool-perf-events-ar )
sudo sysctl kernel.perf_event_paranoid=0


## 20160101_freebsd_build_upgrade_via_source.md

      
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                dch
                / 20160101_freebsd_build_upgrade_via_source.md
            
            
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              May 18, 2020 09:12
            
              
                freebsd upgrade using git or svn source & making a low-fat bootable image aka memstick
              
          
    overview

FreeBSD OS upgrades are done in 3 phases:

install new kernel
install new userland
upgrade all packages

Around these 3 stages, we use zfs snapshot and a git snapshot of /etc to make
rollback and diffing any releases easier. freebsd-version -ku has been used

  
## chaintest.py
#!/usr/bin/python
#
# chaintest   Summarize off-CPU time by kernel stack + 2 waker stacks
#             WORK IN PROGRESS. For Linux, uses BCC, eBPF.
#
# USAGE: chaintest [-h] [-u] [-p PID] [-i INTERVAL] [-T] [duration]
#
# PLEASE DO NOT RUN THIS IN PRODUCTION! This is a work in progress, intended to
# explore chain graphs on Linux, using eBPF capabilities from a particular
# kernel version (4.3ish). This tool will eventually get much better.
	#!/usr/local/Gambit-C/bin/gsi

	; Copyright (C) 2004 by Marc Feeley, All Rights Reserved.

	; This is the "90 minute Scheme to C compiler" presented at the
	; Montreal Scheme/Lisp User Group on October 20, 2004.

	; Usage with Gambit-C 4.0:
	;
	; % ./90-min-scc.scm test.scm
	#!/usr/bin/python
	#
	# chaintest Summarize off-CPU time by kernel stack + 2 waker stacks
	# WORK IN PROGRESS. For Linux, uses BCC, eBPF.
	#
	# USAGE: chaintest [-h] [-u] [-p PID] [-i INTERVAL] [-T] [duration]
	#
	# PLEASE DO NOT RUN THIS IN PRODUCTION! This is a work in progress, intended to
	# explore chain graphs on Linux, using eBPF capabilities from a particular
	# kernel version (4.3ish). This tool will eventually get much better.