https://communities.sas.com/t5/SAS-Programming/How-to-make-SAS-use-all-resources/m-p/556172#M154908 You'll probably see more resource consumption in PROCs that sort and/or aggregates data, such as SQL, SUMMARY and SORT. Set the option FULLSTIMER to monitor resources. Also, set the SORTSIZE option to a value slightly below your setting of MEMSIZE. Sat, 04 May 2019 12:41:28 GMT LinusH 2019-05-04T12:41:28Z https://communities.sas.com/t5/SAS-Programming/How-to-make-SAS-use-all-resources/m-p/555824#M154734 <P>So I have increased SAS MEMSIZE but SAS does not use all of them when running PROC or DATA steps. Is there a way to tell SAS to use all available memory?</P> Fri, 03 May 2019 02:35:18 GMT https://communities.sas.com/t5/SAS-Programming/How-to-make-SAS-use-all-resources/m-p/555824#M154734 somebody 2019-05-03T02:35:18Z https://communities.sas.com/t5/SAS-Programming/How-to-make-SAS-use-all-resources/m-p/555826#M154735 <P>&nbsp;</P> <P>SAS will not use more than it needs.</P> <P>&nbsp;</P> <P>Sometimes SAS does not need all the RAM or all the CPU.</P> <P>It depends on the task at hand.</P> <P>&nbsp;</P> <P>Data steps are typically reading data sets in a sequential manner and doing few calculations, so are limited by the speed of the I/O subsystems and need very little RAM or CPU.</P> Fri, 03 May 2019 02:50:18 GMT https://communities.sas.com/t5/SAS-Programming/How-to-make-SAS-use-all-resources/m-p/555826#M154735 ChrisNZ 2019-05-03T02:50:18Z https://communities.sas.com/t5/SAS-Programming/How-to-make-SAS-use-all-resources/m-p/556172#M154908 You'll probably see more resource consumption in PROCs that sort and/or aggregates data, such as SQL, SUMMARY and SORT. Set the option FULLSTIMER to monitor resources. Also, set the SORTSIZE option to a value slightly below your setting of MEMSIZE. Sat, 04 May 2019 12:41:28 GMT https://communities.sas.com/t5/SAS-Programming/How-to-make-SAS-use-all-resources/m-p/556172#M154908 LinusH 2019-05-04T12:41:28Z