| ----------------------------------------------------------------------------------------------------- | |
| Read Test | |
| fio --name=randread --ioengine=libaio --iodepth=16 --rw=randread --bs=4k --direct=0 --size=512M --numjobs=4 --runtime=240 --group_reporting | |
| ----------------------------------------------------------------------------------------------------- | |
| writes a total 2GB files [4 jobs x 512 MB = 2GB] running 4 processes at a time: | |
| fio --name=randwrite --ioengine=libaio --iodepth=1 --rw=randwrite --bs=4k --direct=0 --size=512M --numjobs=4 --runtime=240 --group_reporting | |
| ----------------------------------------------------------------------------------------------------- | |
| Read Write Performance Test | |
| fio --randrepeat=1 --ioengine=libaio --direct=1 --gtod_reduce=1 --name=test --filename=random_read_write.fio --bs=4k --iodepth=64 --size=4G --readwrite=randrw --rwmixread=75 |
Cloud-init combined with terraform can be a powerful tool to provision instances on startup. Debugging scripts that are run by cloud-init however are not the easiest to debug.
Usually on an Ubuntu machine a lot of what is happening can be found in the syslog
cat /var/log/syslog
| #XLarge DBInstanceClassMemory = 15892177440 = 14.8GB | |
| #/32 = 496630545 = 473MB | |
| #/64 = 248315272 = 236MB | |
| #/128 = 124157636 = 118MB | |
| #/256 = 62078818 = 59MB | |
| #/512 = 31039409 = 29MB | |
| #/12582880 = 1263 #default same divisor as max_connections = 4041.6MB = 4237924762 | |
| #/25165760 = 623 # half of max_connections = 1993.6MB | |
| #/50331520 = 315 # quarter of max_connections = 1008MB = 1056964608 | |
| #*(3/4) #default innodb pool size = 11922309120 |