p*****n
发帖数: 15 | 1 Someone told me data analysis in SAS is very slow because SAS does a lot of
disk I/O. I am new user of SAS. Can anyone explain how SAS exactly manages
the memory and I/O usage? For example, suppose I am manipulating a dataset
with size 1G on a server with memory 64G, will SAS put all the data into
memory? Are there some official documentation about this? Thanks | o****o
发帖数: 8077 | 2 if your memory is big enough, such as in your case, you can load the whole
data into memory and all SAS operations can be done completely in memory, no
disk I/O involved except initial load
for example, check "sasfile" statement
some procedures can specify memory size, for instance: PROC SORT ....
SORTSIZE=4G....
check its online documentation at support.sas.com
of
manages
dataset
【在 p*****n 的大作中提到】
: Someone told me data analysis in SAS is very slow because SAS does a lot of
: disk I/O. I am new user of SAS. Can anyone explain how SAS exactly manages
: the memory and I/O usage? For example, suppose I am manipulating a dataset
: with size 1G on a server with memory 64G, will SAS put all the data into
: memory? Are there some official documentation about this? Thanks
| p*****n
发帖数: 15 | 3 Thanks.
So it seems that by default, sas will not put a big dataset into the memory
(even I have enough memory) unless I tell it to do so.
no
【在 o****o 的大作中提到】
: if your memory is big enough, such as in your case, you can load the whole
: data into memory and all SAS operations can be done completely in memory, no
: disk I/O involved except initial load
: for example, check "sasfile" statement
: some procedures can specify memory size, for instance: PROC SORT ....
: SORTSIZE=4G....
: check its online documentation at support.sas.com
:
: of
: manages
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