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2010 Aug 18
13
Poor creat/delete files performance
Hi,
We did some performance test and found the create/delete files performance
of btrfs is very poor.
The test is that we create 50000 files and measure the file-create time
first, and then delete these 50000 files and measure the file-delete time.
(The attached file is the reproduce program)
The result is following:
(Unit: second)
Create file performance
BtrFS Ext4
Total times:
2009 Jul 02
1
Quantitative Risk Management by McNeil
...following problem.
> Return<-read.csv("data.csv")
> Transpose<-t(Return)
> fit.NH(Transpose, case="NIG", symmetric=FALSE, se=FALSE)
Error: cannot allocate vector of size 57 Kb
In addition: Warning messages:
1: In var.default(data) :
Reached total allocation of 222Mb: see help(memory.size)
2: In optim(par = theta, fn = negloglik, gr = NULL, datavector = data, :
Reached total allocation of 222Mb: see help(memory.size)
3: In optim(par = theta, fn = negloglik, gr = NULL, datavector = data, :
Reached total allocation of 222Mb: see help(memory.size)
In the at...