[R] R with Multicore running on Linux

Madana_Babu madana_babu at infosys.com
Thu Jul 21 23:24:04 CEST 2011

Hi all, 

Currently i am trying this on R which is running on multicore processor. I
am not sure how to use mclapply() function on this task. Can anyone help me. 

# Setting up directory 

# Data is available in the form of multiple structured log files (nearly 10K
log files) 

# I am using the following syntax to get required fields and aggregations
from the logs and creating a file called DF (with 3 columns V2, V14 and

a <- list.files(path = ".", pattern = "2011-07-20", all.files = FALSE,
full.names = FALSE, recursive = FALSE, ignore.case = FALSE) 

for (f in a) 
        dat <- read.csv(f, header=FALSE, sep="\t", na.strings="",dec=".",
strip.white=TRUE, fill=TRUE) 
        data_1 <- sqldf("SELECT V2, V14, MIN(V16) FROM dat WHERE V6=104
GROUP BY V2, V14") 
        DF <- rbind(DF, data_1) 

# Currently this process is taking almost 3 Hrs for me. 

Can anyone help me to use mclapply() on this operation and get this process
completed asap. 

Request you to provide me the syntax. 

Thanks in advance 


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