Re: Memory use by NMaximize (and NMinimize)
- To: mathgroup at smc.vnet.net
- Subject: [mg61513] Re: Memory use by NMaximize (and NMinimize)
- From: Carl Bergstrom <cbergst at u.washington.edu>
- Date: Thu, 20 Oct 2005 05:01:18 -0400 (EDT)
- References: <dj4qeg$j5e$1@smc.vnet.net> <dj7266$cpq$1@smc.vnet.net>
- Sender: owner-wri-mathgroup at wolfram.com
Jens-Peer,
Thanks for the suggestion. This helps greatly!
testHuge takes 792408 bytes for the first iteration and roughly 1700
bytes per iteration thereafter.
What was killing me in my real code was not the initial large outlay, but
rather the repeated small outlays that correspond to each 1700 byte
drain seen
below.
-------------------
In[2]:=
Table[testHuge[],{100}]
Out[2] =
{{792408, {1., {x -> 1.5708}}}, {-8, {1., {x -> 1.5708}}}, {2328, {1.,
{x ->
1.5708}}}, {3160, {1., {x -> 1.5708}}}, {3328, {1., {x ->
1.5708}}}, {3328, {1., {x -> 1.5708}}},
... [snip] ...
1.5708}}}, {1728, {1., {x -> 1.5708}}}, {1712, {1., {x ->
1.5708}}}, {1696, {1., {x -> 1.5708}}}, {1712, {1., {x ->
1.5708}}}, {1696, {1., {x -> 1.5708}}}, {1712, {1., {x ->
1.5708}}}, {1696, {1., {x -> 1.5708}}}, {1976, {1., {x ->
1.5708}}}, {1624, {1., {x -> 1.5708}}}
-----------------
Your function test takes 160,000 fewer bytes for the initial iteration,
but far more
importantly, the per-iteration drain for the subsequent interations is
now down to
about 450 bytes per iteration.
-----------------
In[2]:=
Table[test[],{10}]
Out[2]={{632600, {1., {x -> 1.5708}}}, {-1424, {1., {x ->
1.5708}}}, {-248, {1., {x -> 1.5708}}}, {-288, {1., {x ->
1.5708}}},
... [snip] ...
{480, {1., {x -> 1.5708}}}, {464, {1., {x ->
1.5708}}}, {448, {1., {x -> 1.5708}}}, {464, {1., {x ->
1.5708}}}, {448, {1., {x -> 1.5708}}}, {464, {1., {x ->
1.5708}}}, {448, {1., {x -> 1.5708}}}, {464, {1., {x ->
1.5708}}}, {448, {1., {x -> 1.5708}}}}
----------------
Thank you, very much!
-Carl
-------------------------------------------------------------------
Carl T. Bergstrom cbergst at u.washington.edu
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