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2017 Jul 31
2
read/write performance through mount point by guestmount
I create a *4x256GB-SSD RAID0(/dev/md1)* and I test the performance through
fio.
fio config:
ioengine=libaiodirect=1time_basedruntime=120ramp_time=30size=100g
The sequential read/write performance is:
>
> *read: 2000MB/swrite: 1800MB/s*
Now I make a ext4 on the RAID0(/dev/md1) and mount on /home/.
ANd I create a 100G-disk.qcow2 by guestfish.
> $guestfish
> ><fish>: disk-create disk.qcow2 qcow2 100*1024*1024*1024
> ><fish>: run
> ><fish>: mkfs ext4 /dev/sda
> ><fish>: shutdow...
2002 Jun 24
10
code optimization
I have a function "eval.delta" which does what I want but isn't very
elegant. I have consulted the R documents, MASS, and S Programming. Is
there a practical way to optimize the code? Thank you very much.
Peter B.
Function:
eval.delta <- function(delta){
cat("VALUES\n")
vlr <- NULL
k <- 0
for(j in 1:length(delta)) if(delta[j] <= 2){