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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...