fclairamb’s gists

fclairamb / stack_trace.c

Last active May 7, 2025 14:48 — forked from banthar/stack_trace.c

stacktrace with libunwind and elfutils

	// stack_trace.c
	//
	// gcc stack_trace.c -ldw -lunwind -g -o stack_trace

	#define UNW_LOCAL_ONLY

	#include <elfutils/libdwfl.h>
	#include <libunwind.h>

	#include <stdio.h>

fclairamb / permutation.c

Last active August 29, 2015 14:20

string permutation

	#ifdef SHELL
	gcc -ansi -g $0 && ./a.out
	exit 0
	#endif

	#include <stdio.h>
	#include <string.h>

	void permutation (char * prefix, char * str) {
	int n = strlen(str);

fclairamb / var_sized.c

Last active August 29, 2015 14:11

variable size object

fclairamb / tab.c

Created December 12, 2014 09:34

Multi-dimentionnal C array address

fclairamb / change_oom_score.c

Last active August 29, 2015 14:07

Change OOM priority score

	#ifdef SHELL
	gcc -Wall -Werror $0 && ./a.out
	exit $?
	#endif

	#include <stdio.h>

	void change_oom_score(int oom_adj) {
	FILE * fp = fopen("/proc/self/oom_adj", "w"); // Old one (SK20)
	if ( ! fp ) fp = fopen("/proc/self/oom_score_adj", "w"); // New one

fclairamb / get_ppid_and_name.c

Created October 6, 2014 20:30

posix: Get parent process id and name

fclairamb / cassandra-sstables-count.sh

Last active August 29, 2015 14:07

Cassandra: Number of sstable files

	#!/bin/sh
	# To put in /etc/cron.daily
	date=$(date +%Y-%m-%d)
	cd /var/lib/cassandra/data
	for dir in $(find -mindepth 2 -maxdepth 2 -type d)
	do
	count=$(ls $dir/*-Data.db 2>/dev/null \| wc -l)
	echo ${date}: ${count} >>$dir/sstables_count
	done

fclairamb / gist:68d61b43bb1b9f52ab05

Created September 28, 2014 20:28

Cassandra 2.1 - Repair issue (2)

	INFO [AntiEntropyStage:6] 2014-09-28 22:27:45,482 RepairSession.java:171 - [repair #e4bf3e70-474d-11e4-a221-2fe2626539ec] Received merkle tree for domain from /172.16.66.81
	ERROR [RepairJobTask:1] 2014-09-28 22:27:45,484 RepairJob.java:127 - Error occurred during snapshot phase
	java.lang.RuntimeException: Could not create snapshot at /172.16.66.81
	at org.apache.cassandra.repair.SnapshotTask$SnapshotCallback.onFailure(SnapshotTask.java:77) ~[apache-cassandra-2.1.0.jar:2.1.0]
	at org.apache.cassandra.net.ResponseVerbHandler.doVerb(ResponseVerbHandler.java:48) ~[apache-cassandra-2.1.0.jar:2.1.0]
	at org.apache.cassandra.net.MessageDeliveryTask.run(MessageDeliveryTask.java:62) ~[apache-cassandra-2.1.0.jar:2.1.0]
	at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1145) [na:1.7.0_67]
	at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:615) [na:1.7.0_67]
	at java.lang.Thread.run(Thread.java:745) [na:1.7.0_67]
	ERROR [AntiEntropyStage:6] 2014-09-28 22:27:45,484 C

fclairamb / gist:64fd728741b980979474

Created September 28, 2014 20:22

Cassandra 2.1 - Repair issue

	INFO [AntiEntropyStage:227] 2014-09-28 15:00:41,982 RepairSession.java:171 - [repair #1d30ffe0-474a-11e4-84bd-79f3bc6874b0] Received merkle tree for registrynodedata from /172.16.66.81
	ERROR [AntiEntropyStage:227] 2014-09-28 15:00:41,982 CassandraDaemon.java:166 - Exception in thread Thread[AntiEntropyStage:227,5,main]
	java.lang.ClassCastException: null
	ERROR [RepairJobTask:3] 2014-09-28 15:00:41,983 RepairJob.java:127 - Error occurred during snapshot phase
	java.lang.RuntimeException: Could not create snapshot at /172.16.66.81
	at org.apache.cassandra.repair.SnapshotTask$SnapshotCallback.onFailure(SnapshotTask.java:77) ~[apache-cassandra-2.1.0.jar:2.1.0]
	at org.apache.cassandra.net.ResponseVerbHandler.doVerb(ResponseVerbHandler.java:48) ~[apache-cassandra-2.1.0.jar:2.1.0]
	at org.apache.cassandra.net.MessageDeliveryTask.run(MessageDeliveryTask.java:62) ~[apache-cassandra-2.1.0.jar:2.1.0]
	at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1142) [na:1.8.0_20]
	at java.util.concurren

fclairamb / dijkstra.c

Created July 22, 2014 21:18

Florent Clairambault fclairamb