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POHow to interpret malloc_info
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I am trying to finds out why free(3) does not return memory to the system. I am allocationg ~11GB, calling malloc_info, releasing, calling malloc_info again. But I do not understand the malloc_info output, in particular the difference between reserved memory, and memory currently in use. Best Regards, Even $ uname -a Linux gunda3 2.6.32-358.18.1.el6.x86_64 #1 SMP Wed Aug 28 17:19:38 UTC 2013 x86_64 x86_64 x86_64 GNU/Linux /lib/libc.so.6 GNU C Library stable release version 2.12, by Roland McGrath et al. Copyright (C) 2010 Free Software Foundation, Inc. This is free software; see the source for copying conditions. There is NO warranty; not even for MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. Compiled by GNU CC version 4.4.7 20120313 (Red Hat 4.4.7-3). Compiled on a Linux 2.6.32 system on 2013-08-27. Available extensions: The C stubs add-on version 2.1.2. crypt add-on version 2.1 by Michael Glad and others GNU Libidn by Simon Josefsson Native POSIX Threads Library by Ulrich Drepper et al BIND-8.2.3-T5B RT using linux kernel aio libc ABIs: UNIQUE IFUNC For bug reporting instructions, please see: <a href="http://www.gnu.org/software/libc/bugs.html" rel="nofollow">http://www.gnu.org/software/libc/bugs.html</a>. -------------------- mallinfo.1 after allocating 11GB ------------------- <pre><code><malloc version="1"> <heap nr="0"> <sizes> <size from="17" to="32" total="544" count="17"/> <size from="33" to="48" total="816" count="17"/> <size from="49" to="64" total="64" count="1"/> <size from="33" to="33" total="10395" count="315"/> <size from="49" to="49" total="588" count="12"/> <size from="65" to="65" total="17160" count="264"/> <size from="81" to="81" total="405" count="5"/> <size from="97" to="97" total="12125" count="125"/> <size from="113" to="113" total="339" count="3"/> <size from="129" to="129" total="258" count="2"/> <size from="145" to="145" total="145" count="1"/> <size from="161" to="161" total="483" count="3"/> <size from="193" to="193" total="579" count="3"/> <size from="209" to="209" total="418" count="2"/> <size from="225" to="225" total="15975" count="71"/> <size from="241" to="241" total="241" count="1"/> <size from="273" to="273" total="7644" count="28"/> <size from="321" to="321" total="642" count="2"/> <size from="337" to="337" total="337" count="1"/> <size from="385" to="385" total="385" count="1"/> <size from="449" to="449" total="449" count="1"/> <size from="465" to="465" total="5580" count="12"/> <size from="513" to="513" total="1026" count="2"/> <size from="529" to="529" total="529" count="1"/> <size from="545" to="545" total="545" count="1"/> <size from="561" to="561" total="561" count="1"/> <size from="577" to="577" total="577" count="1"/> <size from="593" to="593" total="593" count="1"/> <size from="609" to="609" total="609" count="1"/> <size from="641" to="641" total="41024" count="64"/> <size from="689" to="689" total="37895" count="55"/> <size from="721" to="721" total="721" count="1"/> <size from="737" to="737" total="5159" count="7"/> <size from="817" to="817" total="1634" count="2"/> <size from="833" to="833" total="833" count="1"/> <size from="849" to="849" total="1698" count="2"/> <size from="881" to="881" total="881" count="1"/> <size from="897" to="897" total="897" count="1"/> <size from="929" to="929" total="1858" count="2"/> <size from="945" to="945" total="945" count="1"/> <size from="977" to="977" total="977" count="1"/> <size from="1009" to="1009" total="1009" count="1"/> <size from="1025" to="1041" total="3091" count="3"/> <size from="1217" to="1265" total="220449" count="177"/> <size from="1281" to="1281" total="2562" count="2"/> <size from="3953" to="4049" total="299402" count="74"/> <size from="5457" to="5457" total="5457" count="1"/> <size from="7985" to="7985" total="7985" count="1"/> <size from="8193" to="8193" total="294948" count="36"/> <size from="12177" to="12241" total="36659" count="3"/> <size from="16129" to="16305" total="32434" count="2"/> <size from="20369" to="20369" total="20369" count="1"/> <size from="29377" to="29377" total="58754" count="2"/> <size from="56689" to="56689" total="56689" count="1"/> <size from="168081" to="168081" total="168081" count="1"/> <size from="1024193" to="224731137" total="1186760443" count="651"/> <unsorted from="177" to="1228360646656" total="4294967473" count="2"/> </sizes> <total type="fast" count="35" size="1424"/> <total type="rest" count="1956" size="5483108915"/> <system type="current" size="2312204288"/> <system type="max" size="2312204288"/> <aspace type="total" size="2312204288"/> <aspace type="mprotect" size="2312204288"/> </heap> <heap nr="1"> <sizes> <size from="17" to="32" total="96" count="3"/> <size from="33" to="48" total="144" count="3"/> <size from="49" to="64" total="128" count="2"/> <size from="33" to="33" total="66" count="2"/> <size from="97" to="97" total="194" count="2"/> <size from="113" to="113" total="113" count="1"/> <size from="145" to="145" total="145" count="1"/> <size from="193" to="193" total="386" count="2"/> <size from="209" to="209" total="209" count="1"/> <size from="369" to="369" total="369" count="1"/> <size from="385" to="385" total="385" count="1"/> <size from="673" to="673" total="1346" count="2"/> <size from="737" to="737" total="737" count="1"/> <size from="753" to="753" total="753" count="1"/> <size from="785" to="785" total="785" count="1"/> <size from="1345" to="1345" total="1345" count="1"/> <size from="1633" to="1633" total="1633" count="1"/> <size from="3169" to="3169" total="3169" count="1"/> <size from="14017" to="14017" total="14017" count="1"/> <unsorted from="177" to="1228360646656" total="4294967666" count="3"/> </sizes> <total type="fast" count="8" size="368"/> <total type="rest" count="23" size="4294993318"/> <system type="current" size="6991872"/> <system type="max" size="7102464"/> <aspace type="total" size="6991872"/> <aspace type="mprotect" size="7102464"/> </heap> <heap nr="2"> <sizes> <size from="49" to="64" total="64" count="1"/> <unsorted from="177" to="1228360646656" total="4294967843" count="4"/> </sizes> <total type="fast" count="1" size="64"/> <total type="rest" count="4" size="4294967843"/> <system type="current" size="135168"/> <system type="max" size="135168"/> <aspace type="total" size="135168"/> <aspace type="mprotect" size="135168"/> </heap> <heap nr="3"> <sizes> <size from="49" to="64" total="64" count="1"/> <unsorted from="177" to="1228360646656" total="4294968020" count="5"/> </sizes> <total type="fast" count="1" size="64"/> <total type="rest" count="5" size="4294968020"/> <system type="current" size="135168"/> <system type="max" size="135168"/> <aspace type="total" size="135168"/> <aspace type="mprotect" size="135168"/> </heap> <heap nr="4"> <sizes> <size from="49" to="64" total="64" count="1"/> <unsorted from="177" to="1228360646656" total="4294968197" count="6"/> </sizes> <total type="fast" count="1" size="64"/> <total type="rest" count="6" size="4294968197"/> <system type="current" size="135168"/> <system type="max" size="135168"/> <aspace type="total" size="135168"/> <aspace type="mprotect" size="135168"/> </heap> <heap nr="5"> <sizes> <size from="49" to="64" total="64" count="1"/> <unsorted from="177" to="1228360646656" total="4294968374" count="7"/> </sizes> <total type="fast" count="1" size="64"/> <total type="rest" count="7" size="4294968374"/> <system type="current" size="135168"/> <system type="max" size="135168"/> <aspace type="total" size="135168"/> <aspace type="mprotect" size="135168"/> </heap> <heap nr="6"> <sizes> <size from="17" to="32" total="32" count="1"/> <size from="6481" to="6481" total="6481" count="1"/> <size from="126929" to="126929" total="126929" count="1"/> <size from="1070257" to="7930721" total="14366131" count="3"/> <unsorted from="49" to="1228360646656" total="4322601393" count="34"/> </sizes> <total type="fast" count="1" size="32"/> <total type="rest" count="39" size="4337100934"/> <system type="current" size="64720896"/> <system type="max" size="169734144"/> <aspace type="total" size="64720896"/> <aspace type="mprotect" size="66654208"/> </heap> <heap nr="7"> <sizes> <size from="49" to="64" total="64" count="1"/> <unsorted from="49" to="1228360646656" total="4322601570" count="35"/> </sizes> <total type="fast" count="1" size="64"/> <total type="rest" count="35" size="4322601570"/> <system type="current" size="135168"/> <system type="max" size="135168"/> <aspace type="total" size="135168"/> <aspace type="mprotect" size="135168"/> </heap> <heap nr="8"> <sizes> <size from="49" to="64" total="64" count="1"/> <unsorted from="49" to="1228360646656" total="4322601747" count="36"/> </sizes> <total type="fast" count="1" size="64"/> <total type="rest" count="36" size="4322601747"/> <system type="current" size="135168"/> <system type="max" size="135168"/> <aspace type="total" size="135168"/> <aspace type="mprotect" size="135168"/> </heap> <heap nr="9"> <sizes> <size from="49" to="64" total="64" count="1"/> <unsorted from="49" to="1228360646656" total="4322601924" count="37"/> </sizes> <total type="fast" count="1" size="64"/> <total type="rest" count="37" size="4322601924"/> <system type="current" size="135168"/> <system type="max" size="135168"/> <aspace type="total" size="135168"/> <aspace type="mprotect" size="135168"/> </heap> <heap nr="10"> <sizes> <size from="49" to="64" total="64" count="1"/> <unsorted from="49" to="1228360646656" total="4322602101" count="38"/> </sizes> <total type="fast" count="1" size="64"/> <total type="rest" count="38" size="4322602101"/> <system type="current" size="135168"/> <system type="max" size="135168"/> <aspace type="total" size="135168"/> <aspace type="mprotect" size="135168"/> </heap> <heap nr="11"> <sizes> <size from="49" to="64" total="64" count="1"/> <unsorted from="49" to="1228360646656" total="4322602278" count="39"/> </sizes> <total type="fast" count="1" size="64"/> <total type="rest" count="39" size="4322602278"/> <system type="current" size="135168"/> <system type="max" size="135168"/> <aspace type="total" size="135168"/> <aspace type="mprotect" size="135168"/> </heap> <heap nr="12"> <sizes> <size from="49" to="64" total="64" count="1"/> <unsorted from="49" to="1228360646656" total="4322602455" count="40"/> </sizes> <total type="fast" count="1" size="64"/> <total type="rest" count="40" size="4322602455"/> <system type="current" size="135168"/> <system type="max" size="135168"/> <aspace type="total" size="135168"/> <aspace type="mprotect" size="135168"/> </heap> <heap nr="13"> <sizes> <size from="49" to="64" total="64" count="1"/> <unsorted from="49" to="1228360646656" total="4322602632" count="41"/> </sizes> <total type="fast" count="1" size="64"/> <total type="rest" count="41" size="4322602632"/> <system type="current" size="135168"/> <system type="max" size="135168"/> <aspace type="total" size="135168"/> <aspace type="mprotect" size="135168"/> </heap> <heap nr="14"> <sizes> <size from="49" to="64" total="64" count="1"/> <unsorted from="49" to="1228360646656" total="4322602809" count="42"/> </sizes> <total type="fast" count="1" size="64"/> <total type="rest" count="42" size="4322602809"/> <system type="current" size="135168"/> <system type="max" size="135168"/> <aspace type="total" size="135168"/> <aspace type="mprotect" size="135168"/> </heap> <heap nr="15"> <sizes> <size from="17" to="32" total="32" count="1"/> <size from="49" to="64" total="64" count="1"/> <size from="49" to="49" total="2414818" count="49282"/> <size from="69665" to="69665" total="69665" count="1"/> <unsorted from="49" to="1228360646656" total="4322602986" count="43"/> </sizes> <total type="fast" count="2" size="96"/> <total type="rest" count="49326" size="4325087469"/> <system type="current" size="7906492416"/> <system type="max" size="7908241408"/> <aspace type="total" size="24018944"/> <aspace type="mprotect" size="25767936"/> </heap> <total type="fast" count="58" size="2688"/> <total type="rest" count="51674" size="70200980586"/> <system type="current" size="10292031488"/> <system type="max" size="10398904320"/> <aspace type="total" size="2409558016"/> <aspace type="mprotect" size="2413350912"/> </malloc> </code></pre> --------------------------------- mallinfo.2 - after releasing memory --------------- <pre><code><malloc version="1"> <heap nr="0"> <sizes> <size from="49" to="64" total="64" count="1"/> <size from="33" to="33" total="11121" count="337"/> <size from="49" to="49" total="1323" count="27"/> <size from="65" to="65" total="17940" count="276"/> <size from="81" to="81" total="324" count="4"/> <size from="97" to="97" total="485" count="5"/> <size from="113" to="113" total="339" count="3"/> <size from="129" to="129" total="258" count="2"/> <size from="145" to="145" total="145" count="1"/> <size from="161" to="161" total="161" count="1"/> <size from="337" to="337" total="337" count="1"/> <size from="497" to="497" total="497" count="1"/> <size from="529" to="529" total="1587" count="3"/> <size from="721" to="721" total="721" count="1"/> <size from="1073" to="1073" total="1073" count="1"/> <size from="1297" to="1297" total="1297" count="1"/> <size from="1665" to="1665" total="1665" count="1"/> <size from="1841" to="1841" total="1841" count="1"/> <size from="1857" to="1857" total="1857" count="1"/> <size from="2497" to="2497" total="2497" count="1"/> <size from="3089" to="3089" total="37068" count="12"/> <size from="3617" to="3617" total="68723" count="19"/> <size from="6001" to="6001" total="6001" count="1"/> <size from="7649" to="7649" total="7649" count="1"/> <size from="8801" to="9073" total="44997" count="5"/> <size from="10673" to="10673" total="10673" count="1"/> <size from="12673" to="16001" total="571052" count="44"/> <size from="17937" to="18465" total="217804" count="12"/> <size from="20497" to="24353" total="1766880" count="80"/> <size from="27313" to="28497" total="55810" count="2"/> <size from="30257" to="31601" total="915085" count="29"/> <size from="35937" to="36369" total="72306" count="2"/> <size from="36881" to="40497" total="522845" count="13"/> <size from="41025" to="61313" total="483387" count="11"/> <size from="85921" to="85921" total="85921" count="1"/> <size from="98337" to="98337" total="196674" count="2"/> <size from="155585" to="163649" total="319234" count="2"/> <size from="196065" to="253825" total="699763" count="3"/> <size from="303409" to="488865" total="154161233" count="321"/> <size from="585665" to="224731137" total="1608964043" count="651"/> <unsorted from="177" to="1228360646656" total="4294968770" count="3"/> </sizes> <total type="fast" count="1" size="64"/> <total type="rest" count="1883" size="6064221386"/> <system type="current" size="2312204288"/> <system type="max" size="2312204288"/> <aspace type="total" size="2312204288"/> <aspace type="mprotect" size="2312204288"/> </heap> <heap nr="1"> <sizes> <size from="17" to="32" total="64" count="2"/> <size from="33" to="48" total="48" count="1"/> <size from="49" to="64" total="64" count="1"/> <size from="33" to="33" total="99" count="3"/> <size from="49" to="49" total="49" count="1"/> <size from="97" to="97" total="485" count="5"/> <size from="113" to="113" total="113" count="1"/> <size from="145" to="145" total="145" count="1"/> <size from="577" to="577" total="577" count="1"/> <size from="593" to="593" total="593" count="1"/> <size from="609" to="609" total="609" count="1"/> <size from="769" to="769" total="769" count="1"/> <size from="785" to="785" total="1570" count="2"/> <size from="1361" to="1361" total="1361" count="1"/> <size from="1537" to="1537" total="1537" count="1"/> <size from="1793" to="1793" total="1793" count="1"/> <size from="2881" to="2881" total="2881" count="1"/> <size from="3921" to="3921" total="3921" count="1"/> <size from="13057" to="13057" total="13057" count="1"/> <size from="24961" to="24961" total="24961" count="1"/> <size from="61489" to="61489" total="61489" count="1"/> <unsorted from="177" to="1228360646656" total="4294968963" count="4"/> </sizes> <total type="fast" count="4" size="176"/> <total type="rest" count="29" size="4295084972"/> <system type="current" size="6836224"/> <system type="max" size="7102464"/> <aspace type="total" size="6836224"/> <aspace type="mprotect" size="7102464"/> </heap> <heap nr="2"> <sizes> <size from="49" to="64" total="64" count="1"/> <unsorted from="177" to="1228360646656" total="4294969140" count="5"/> </sizes> <total type="fast" count="1" size="64"/> <total type="rest" count="5" size="4294969140"/> <system type="current" size="135168"/> <system type="max" size="135168"/> <aspace type="total" size="135168"/> <aspace type="mprotect" size="135168"/> </heap> <heap nr="3"> <sizes> <size from="49" to="64" total="64" count="1"/> <unsorted from="177" to="1228360646656" total="4294969317" count="6"/> </sizes> <total type="fast" count="1" size="64"/> <total type="rest" count="6" size="4294969317"/> <system type="current" size="135168"/> <system type="max" size="135168"/> <aspace type="total" size="135168"/> <aspace type="mprotect" size="135168"/> </heap> <heap nr="4"> <sizes> <size from="49" to="64" total="64" count="1"/> <unsorted from="177" to="1228360646656" total="4294969494" count="7"/> </sizes> <total type="fast" count="1" size="64"/> <total type="rest" count="7" size="4294969494"/> <system type="current" size="135168"/> <system type="max" size="135168"/> <aspace type="total" size="135168"/> <aspace type="mprotect" size="135168"/> </heap> <heap nr="5"> <sizes> <size from="49" to="64" total="64" count="1"/> <unsorted from="177" to="1228360646656" total="4294969671" count="8"/> </sizes> <total type="fast" count="1" size="64"/> <total type="rest" count="8" size="4294969671"/> <system type="current" size="135168"/> <system type="max" size="135168"/> <aspace type="total" size="135168"/> <aspace type="mprotect" size="135168"/> </heap> <heap nr="6"> <sizes> <unsorted from="177" to="1228360646656" total="4334883313" count="34"/> </sizes> <total type="fast" count="0" size="0"/> <total type="rest" count="34" size="4334883313"/> <system type="current" size="62480384"/> <system type="max" size="169734144"/> <aspace type="total" size="62480384"/> <aspace type="mprotect" size="66654208"/> </heap> <heap nr="7"> <sizes> <size from="49" to="64" total="64" count="1"/> <unsorted from="177" to="1228360646656" total="4334883490" count="35"/> </sizes> <total type="fast" count="1" size="64"/> <total type="rest" count="35" size="4334883490"/> <system type="current" size="135168"/> <system type="max" size="135168"/> <aspace type="total" size="135168"/> <aspace type="mprotect" size="135168"/> </heap> <heap nr="8"> <sizes> <size from="49" to="64" total="64" count="1"/> <unsorted from="177" to="1228360646656" total="4334883667" count="36"/> </sizes> <total type="fast" count="1" size="64"/> <total type="rest" count="36" size="4334883667"/> <system type="current" size="135168"/> <system type="max" size="135168"/> <aspace type="total" size="135168"/> <aspace type="mprotect" size="135168"/> </heap> <heap nr="9"> <sizes> <size from="49" to="64" total="64" count="1"/> <unsorted from="177" to="1228360646656" total="4334883844" count="37"/> </sizes> <total type="fast" count="1" size="64"/> <total type="rest" count="37" size="4334883844"/> <system type="current" size="135168"/> <system type="max" size="135168"/> <aspace type="total" size="135168"/> <aspace type="mprotect" size="135168"/> </heap> <heap nr="10"> <sizes> <size from="49" to="64" total="64" count="1"/> <unsorted from="177" to="1228360646656" total="4334884021" count="38"/> </sizes> <total type="fast" count="1" size="64"/> <total type="rest" count="38" size="4334884021"/> <system type="current" size="135168"/> <system type="max" size="135168"/> <aspace type="total" size="135168"/> <aspace type="mprotect" size="135168"/> </heap> <heap nr="11"> <sizes> <size from="49" to="64" total="64" count="1"/> <unsorted from="177" to="1228360646656" total="4334884198" count="39"/> </sizes> <total type="fast" count="1" size="64"/> <total type="rest" count="39" size="4334884198"/> <system type="current" size="135168"/> <system type="max" size="135168"/> <aspace type="total" size="135168"/> <aspace type="mprotect" size="135168"/> </heap> <heap nr="12"> <sizes> <size from="49" to="64" total="64" count="1"/> <unsorted from="177" to="1228360646656" total="4334884375" count="40"/> </sizes> <total type="fast" count="1" size="64"/> <total type="rest" count="40" size="4334884375"/> <system type="current" size="135168"/> <system type="max" size="135168"/> <aspace type="total" size="135168"/> <aspace type="mprotect" size="135168"/> </heap> <heap nr="13"> <sizes> <size from="49" to="64" total="64" count="1"/> <unsorted from="177" to="1228360646656" total="4334884552" count="41"/> </sizes> <total type="fast" count="1" size="64"/> <total type="rest" count="41" size="4334884552"/> <system type="current" size="135168"/> <system type="max" size="135168"/> <aspace type="total" size="135168"/> <aspace type="mprotect" size="135168"/> </heap> <heap nr="14"> <sizes> <size from="49" to="64" total="64" count="1"/> <unsorted from="177" to="1228360646656" total="4334884729" count="42"/> </sizes> <total type="fast" count="1" size="64"/> <total type="rest" count="42" size="4334884729"/> <system type="current" size="135168"/> <system type="max" size="135168"/> <aspace type="total" size="135168"/> <aspace type="mprotect" size="135168"/> </heap> <heap nr="15"> <sizes> <unsorted from="177" to="1228360646656" total="12229128699" count="220"/> </sizes> <total type="fast" count="0" size="0"/> <total type="rest" count="220" size="12229128699"/> <system type="current" size="7906492416"/> <system type="max" size="7908241408"/> <aspace type="total" size="24018944"/> <aspace type="mprotect" size="25767936"/> </heap> <total type="fast" count="17" size="1008"/> <total type="rest" count="2500" size="78782268868"/> <system type="current" size="10289635328"/> <system type="max" size="10398904320"/> <aspace type="total" size="2407161856"/> <aspace type="mprotect" size="2413350912"/> </malloc> </code></pre>
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<c><linux><malloc>
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How to interpret malloc_info
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plurals
PostLinksPostIdRelatedPostId
1. PL
 singulars
 LinkTypeLinkTypeId
 LTLinked
PostLinksRelatedPostIdPostId
1. This table or related slice is empty.
PostsAcceptedAnswerId
1. This table or related slice is empty.
PostsParentIdCreationDate
1. This table or related slice is empty.
VotesPostIdCreationDate
1. VO
 singulars
 PostPostId
 POHow to interpret malloc_info
 UserUserId
 This table or related slice is empty.
 VoteTypeVoteTypeId
 VTUpMod
CommentsPostId

Querying!

Guidance

A row detail

Detail views are divided into sections. All the information in the data section comes from columns in the selected row. The other sections display data from other, related rows.

Related data can be related in a to-one or a to-many fashion. Captions of data related in a to-many fashion link to a list view showing a filtered view of the table.

Try moving around until you find a non-empty to-many entry and click on the label to get to one. You can move back to the root by clicking on the database name in the header.