Meaning of the swap part in the top command

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Do you know in which unit the swap column is display in the top output?



According with top documentation it is in KB, but please take a look in the below image.



enter image description here



What means g or m next to the swap value?



Thanks in advance for your kind support




linux top




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  • 3




    Please do not post pictures of text. Just paste the text.
    – DopeGhoti
    Apr 2 at 16:30














up vote
0
down vote

favorite












Do you know in which unit the swap column is display in the top output?



According with top documentation it is in KB, but please take a look in the below image.



enter image description here



What means g or m next to the swap value?



Thanks in advance for your kind support




linux top




share|improve this question
















  • 3




    Please do not post pictures of text. Just paste the text.
    – DopeGhoti
    Apr 2 at 16:30












up vote
0
down vote

favorite









up vote
0
down vote

favorite











Do you know in which unit the swap column is display in the top output?



According with top documentation it is in KB, but please take a look in the below image.



enter image description here



What means g or m next to the swap value?



Thanks in advance for your kind support




linux top




share|improve this question












Do you know in which unit the swap column is display in the top output?



According with top documentation it is in KB, but please take a look in the below image.



enter image description here



What means g or m next to the swap value?



Thanks in advance for your kind support





linux top





share|improve this question











share|improve this question




share|improve this question










asked Apr 2 at 16:25









federico

31




31







  • 3




    Please do not post pictures of text. Just paste the text.
    – DopeGhoti
    Apr 2 at 16:30












  • 3




    Please do not post pictures of text. Just paste the text.
    – DopeGhoti
    Apr 2 at 16:30







3




3




Please do not post pictures of text. Just paste the text.
– DopeGhoti
Apr 2 at 16:30




Please do not post pictures of text. Just paste the text.
– DopeGhoti
Apr 2 at 16:30










1 Answer
1






active

oldest

votes

















up vote
2
down vote



accepted










If you are referring to the values in the SWAP column, then g means "Gibibytes" (GiB) and m means "Mebibytes" (MiB). This is also true for the values in the header (but the letters used are upper-case).



I believe that it is the base 2-based units rather than the base 10-based units that are in use (judging from the top manual on a Linux system).



According to this ServerFault answer:




Top (at least in some versions) calculates SWAP per process as VIRT - RSS instead of reporting real swap usage. Under Linux the result is a completely meaningless number.




And from another answer at ServerFault:




The top tool uses a broken formula to calculate what it erroneously reports as swap space. It is in fact the result of subtracting the resident set size from the address space size. This is a boneheaded thing to do since one is a measure of virtual memory and the other is a measure of physical memory. So it's not entirely clear what the result is even a measure of at all.







share|improve this answer






















  • I referred to the highlighted column, Swap column. In total I have 21GB swap memory, and the first process is using 57g. Could this mean 57GB of swap used?
    – federico
    Apr 2 at 16:32











  • @federico Ah, I missed that one. It's the same there.
    – Kusalananda
    Apr 2 at 16:39










  • @federico See updated answer.
    – Kusalananda
    Apr 2 at 16:46










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1 Answer
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active

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1 Answer
1






active

oldest

votes









active

oldest

votes






active

oldest

votes








up vote
2
down vote



accepted










If you are referring to the values in the SWAP column, then g means "Gibibytes" (GiB) and m means "Mebibytes" (MiB). This is also true for the values in the header (but the letters used are upper-case).



I believe that it is the base 2-based units rather than the base 10-based units that are in use (judging from the top manual on a Linux system).



According to this ServerFault answer:




Top (at least in some versions) calculates SWAP per process as VIRT - RSS instead of reporting real swap usage. Under Linux the result is a completely meaningless number.




And from another answer at ServerFault:




The top tool uses a broken formula to calculate what it erroneously reports as swap space. It is in fact the result of subtracting the resident set size from the address space size. This is a boneheaded thing to do since one is a measure of virtual memory and the other is a measure of physical memory. So it's not entirely clear what the result is even a measure of at all.







share|improve this answer






















  • I referred to the highlighted column, Swap column. In total I have 21GB swap memory, and the first process is using 57g. Could this mean 57GB of swap used?
    – federico
    Apr 2 at 16:32











  • @federico Ah, I missed that one. It's the same there.
    – Kusalananda
    Apr 2 at 16:39










  • @federico See updated answer.
    – Kusalananda
    Apr 2 at 16:46














up vote
2
down vote



accepted










If you are referring to the values in the SWAP column, then g means "Gibibytes" (GiB) and m means "Mebibytes" (MiB). This is also true for the values in the header (but the letters used are upper-case).



I believe that it is the base 2-based units rather than the base 10-based units that are in use (judging from the top manual on a Linux system).



According to this ServerFault answer:




Top (at least in some versions) calculates SWAP per process as VIRT - RSS instead of reporting real swap usage. Under Linux the result is a completely meaningless number.




And from another answer at ServerFault:




The top tool uses a broken formula to calculate what it erroneously reports as swap space. It is in fact the result of subtracting the resident set size from the address space size. This is a boneheaded thing to do since one is a measure of virtual memory and the other is a measure of physical memory. So it's not entirely clear what the result is even a measure of at all.







share|improve this answer






















  • I referred to the highlighted column, Swap column. In total I have 21GB swap memory, and the first process is using 57g. Could this mean 57GB of swap used?
    – federico
    Apr 2 at 16:32











  • @federico Ah, I missed that one. It's the same there.
    – Kusalananda
    Apr 2 at 16:39










  • @federico See updated answer.
    – Kusalananda
    Apr 2 at 16:46












up vote
2
down vote



accepted







up vote
2
down vote



accepted






If you are referring to the values in the SWAP column, then g means "Gibibytes" (GiB) and m means "Mebibytes" (MiB). This is also true for the values in the header (but the letters used are upper-case).



I believe that it is the base 2-based units rather than the base 10-based units that are in use (judging from the top manual on a Linux system).



According to this ServerFault answer:




Top (at least in some versions) calculates SWAP per process as VIRT - RSS instead of reporting real swap usage. Under Linux the result is a completely meaningless number.




And from another answer at ServerFault:




The top tool uses a broken formula to calculate what it erroneously reports as swap space. It is in fact the result of subtracting the resident set size from the address space size. This is a boneheaded thing to do since one is a measure of virtual memory and the other is a measure of physical memory. So it's not entirely clear what the result is even a measure of at all.







share|improve this answer














If you are referring to the values in the SWAP column, then g means "Gibibytes" (GiB) and m means "Mebibytes" (MiB). This is also true for the values in the header (but the letters used are upper-case).



I believe that it is the base 2-based units rather than the base 10-based units that are in use (judging from the top manual on a Linux system).



According to this ServerFault answer:




Top (at least in some versions) calculates SWAP per process as VIRT - RSS instead of reporting real swap usage. Under Linux the result is a completely meaningless number.




And from another answer at ServerFault:




The top tool uses a broken formula to calculate what it erroneously reports as swap space. It is in fact the result of subtracting the resident set size from the address space size. This is a boneheaded thing to do since one is a measure of virtual memory and the other is a measure of physical memory. So it's not entirely clear what the result is even a measure of at all.








share|improve this answer














share|improve this answer



share|improve this answer








edited Apr 2 at 16:46

























answered Apr 2 at 16:29









Kusalananda

102k13201317




102k13201317











  • I referred to the highlighted column, Swap column. In total I have 21GB swap memory, and the first process is using 57g. Could this mean 57GB of swap used?
    – federico
    Apr 2 at 16:32











  • @federico Ah, I missed that one. It's the same there.
    – Kusalananda
    Apr 2 at 16:39










  • @federico See updated answer.
    – Kusalananda
    Apr 2 at 16:46
















  • I referred to the highlighted column, Swap column. In total I have 21GB swap memory, and the first process is using 57g. Could this mean 57GB of swap used?
    – federico
    Apr 2 at 16:32











  • @federico Ah, I missed that one. It's the same there.
    – Kusalananda
    Apr 2 at 16:39










  • @federico See updated answer.
    – Kusalananda
    Apr 2 at 16:46















I referred to the highlighted column, Swap column. In total I have 21GB swap memory, and the first process is using 57g. Could this mean 57GB of swap used?
– federico
Apr 2 at 16:32





I referred to the highlighted column, Swap column. In total I have 21GB swap memory, and the first process is using 57g. Could this mean 57GB of swap used?
– federico
Apr 2 at 16:32













@federico Ah, I missed that one. It's the same there.
– Kusalananda
Apr 2 at 16:39




@federico Ah, I missed that one. It's the same there.
– Kusalananda
Apr 2 at 16:39












@federico See updated answer.
– Kusalananda
Apr 2 at 16:46




@federico See updated answer.
– Kusalananda
Apr 2 at 16:46












 

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