System Monitor reports different memory usage to htop - which should I believe?












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I've used both the preinstalled System Monitor and the htop app in Ubuntu and I've noticed differences in their outputs - the first shows higher memory usage. Which one is more accurate? Thanks.










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    Possible reasons for different values could be rounding differences, GB (base 1000) vs GiB (base 1024), treating some usage types (like shared memory, buffers, caches, ...) differently, etc. When in doubt, I would look at the output of free and trust that.

    – Byte Commander
    Feb 23 at 21:36











  • All are accurate, as they all read data from /proc/meminfo. You have to learn what those numbers mean to understand the difference.

    – mikewhatever
    Feb 23 at 21:55













  • also see linuxatemyram.com

    – guntbert
    yesterday
















0















I've used both the preinstalled System Monitor and the htop app in Ubuntu and I've noticed differences in their outputs - the first shows higher memory usage. Which one is more accurate? Thanks.










share|improve this question




















  • 1





    Possible reasons for different values could be rounding differences, GB (base 1000) vs GiB (base 1024), treating some usage types (like shared memory, buffers, caches, ...) differently, etc. When in doubt, I would look at the output of free and trust that.

    – Byte Commander
    Feb 23 at 21:36











  • All are accurate, as they all read data from /proc/meminfo. You have to learn what those numbers mean to understand the difference.

    – mikewhatever
    Feb 23 at 21:55













  • also see linuxatemyram.com

    – guntbert
    yesterday














0












0








0








I've used both the preinstalled System Monitor and the htop app in Ubuntu and I've noticed differences in their outputs - the first shows higher memory usage. Which one is more accurate? Thanks.










share|improve this question
















I've used both the preinstalled System Monitor and the htop app in Ubuntu and I've noticed differences in their outputs - the first shows higher memory usage. Which one is more accurate? Thanks.







memory-usage






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edited 8 hours ago









Zanna

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asked Feb 23 at 21:17









Nikos LagiosNikos Lagios

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  • 1





    Possible reasons for different values could be rounding differences, GB (base 1000) vs GiB (base 1024), treating some usage types (like shared memory, buffers, caches, ...) differently, etc. When in doubt, I would look at the output of free and trust that.

    – Byte Commander
    Feb 23 at 21:36











  • All are accurate, as they all read data from /proc/meminfo. You have to learn what those numbers mean to understand the difference.

    – mikewhatever
    Feb 23 at 21:55













  • also see linuxatemyram.com

    – guntbert
    yesterday














  • 1





    Possible reasons for different values could be rounding differences, GB (base 1000) vs GiB (base 1024), treating some usage types (like shared memory, buffers, caches, ...) differently, etc. When in doubt, I would look at the output of free and trust that.

    – Byte Commander
    Feb 23 at 21:36











  • All are accurate, as they all read data from /proc/meminfo. You have to learn what those numbers mean to understand the difference.

    – mikewhatever
    Feb 23 at 21:55













  • also see linuxatemyram.com

    – guntbert
    yesterday








1




1





Possible reasons for different values could be rounding differences, GB (base 1000) vs GiB (base 1024), treating some usage types (like shared memory, buffers, caches, ...) differently, etc. When in doubt, I would look at the output of free and trust that.

– Byte Commander
Feb 23 at 21:36





Possible reasons for different values could be rounding differences, GB (base 1000) vs GiB (base 1024), treating some usage types (like shared memory, buffers, caches, ...) differently, etc. When in doubt, I would look at the output of free and trust that.

– Byte Commander
Feb 23 at 21:36













All are accurate, as they all read data from /proc/meminfo. You have to learn what those numbers mean to understand the difference.

– mikewhatever
Feb 23 at 21:55







All are accurate, as they all read data from /proc/meminfo. You have to learn what those numbers mean to understand the difference.

– mikewhatever
Feb 23 at 21:55















also see linuxatemyram.com

– guntbert
yesterday





also see linuxatemyram.com

– guntbert
yesterday










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