From 6cc7d88683f581fd6a1619aea8c3c5309f4f4013 Mon Sep 17 00:00:00 2001 From: Christopher Meiklejohn Date: Wed, 2 Oct 2013 16:26:19 -0500 Subject: Fix incorrect reporting of memory on OS X via memsup. Application memsup should be calculating free memory using the speculative pages, in the same manner that the Activity Monitor and top programs on OS X do. In addition, correct page size to 4096, based on verification of available memory between top, vm_stat and Activity Monitor. --- lib/os_mon/src/memsup.erl | 19 +++++++++---------- 1 file changed, 9 insertions(+), 10 deletions(-) diff --git a/lib/os_mon/src/memsup.erl b/lib/os_mon/src/memsup.erl index a1b8591c8c..b178732fae 100644 --- a/lib/os_mon/src/memsup.erl +++ b/lib/os_mon/src/memsup.erl @@ -721,20 +721,19 @@ reply(Pending, MemUsage, SysMemUsage) -> %% get_memory_usage(OS) -> {Alloc, Total} %% Darwin: -%% Uses vm_stat command. This appears to lie about the page size in -%% Mac OS X 10.2.2 - the pages given are based on 4000 bytes, but -%% the vm_stat command tells us that it is 4096... +%% Uses vm_stat command. get_memory_usage({unix,darwin}) -> Str1 = os:cmd("/usr/bin/vm_stat"), - - {[Free], Str2} = fread_value("Pages free:~d.", Str1), - {[Active], Str3} = fread_value("Pages active:~d.", Str2), - {[Inactive], Str4} = fread_value("Pages inactive:~d.", Str3), - {[_], Str5} = fread_value("Pages speculative:~d.", Str4), + PageSize = 4096, + + {[Free], Str2} = fread_value("Pages free:~d.", Str1), + {[Active], Str3} = fread_value("Pages active:~d.", Str2), + {[Inactive], Str4} = fread_value("Pages inactive:~d.", Str3), + {[Speculative], Str5} = fread_value("Pages speculative:~d.", Str4), {[Wired], _} = fread_value("Pages wired down:~d.", Str5), - NMemUsed = (Wired + Active + Inactive) * 4000, - NMemTotal = NMemUsed + Free * 4000, + NMemUsed = (Wired + Active + Inactive) * PageSize, + NMemTotal = NMemUsed + (Free + Speculative) * PageSize, {NMemUsed,NMemTotal}; %% FreeBSD: Look in /usr/include/sys/vmmeter.h for the format of struct -- cgit v1.2.3