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<DIV>Is Ipopt failing at that iteration 76, or does it continue? What’s more
important than the number of variables is the number of nonzeros in the Hessian
and Jacobian. Some problems of that size MA27 should be fine, but if your
problem is very dense or numerically challenging then it may start having
trouble. Most times I’ve seen that flag it has just been a warning, a diagnostic
message that your problem is resulting in a large amount of “fill-in” during the
factorization. If you have academic access to the other solvers, it’s worth
giving all of them a try for comparison purposes. You just have to have them
available when you compile Ipopt, or in an external library and use the linear
solver loader.</DIV>
<DIV> </DIV>
<DIV>-Tony</DIV>
<DIV> </DIV>
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<DIV style="font-color: black"><B>From:</B> <A title=leihao@staff.sina.com.cn
href="mailto:leihao@staff.sina.com.cn">leihao</A> </DIV>
<DIV><B>Sent:</B> Monday, October 28, 2013 3:06 AM</DIV>
<DIV><B>To:</B> <A title=ipopt@list.coin-or.org
href="mailto:ipopt@list.coin-or.org">ipopt</A> </DIV>
<DIV><B>Subject:</B> [Ipopt] solver MA27 out of memory</DIV></DIV></DIV>
<DIV> </DIV></DIV>
<DIV
style="FONT-SIZE: small; FONT-FAMILY: 'Calibri'; FONT-WEIGHT: normal; COLOR: #000000; FONT-STYLE: normal; TEXT-DECORATION: none; DISPLAY: inline">hi
all:<BR><BR>I use MA27 as my default solver.<BR>There are 15000 <SPAN
style="WHITE-SPACE: normal; TEXT-TRANSFORM: none; WORD-SPACING: 0px; FLOAT: none; COLOR: rgb(67,67,67); FONT: bold 14px/24px arial, sans-serif; DISPLAY: inline !important; LETTER-SPACING: normal; TEXT-INDENT: 0px; -webkit-text-stroke-width: 0px">Variables
</SPAN>for my question .<BR>the input data may be too large and
ipopt print information as below:<BR><I><BR></I><I> 66r
2.7573601e+12 1.18e+06 9.88e+02 6.9 2.49e+08
- 5.62e-05 7.61e-03f 1</I><I><BR></I><I> 67r 2.7545993e+12
1.18e+06 9.88e+02 -0.1 1.73e+10 - 9.70e-05
1.12e-03f 1</I><I><BR></I><I> 68 4.7698193e+11 4.40e+05
5.37e-01 2.2 3.33e+07 - 1.12e-02
6.26e-01h 1</I><I><BR></I><I> 69 1.8904455e+11 1.13e+05
1.09e+00 2.4 2.81e+06 - 6.92e-02
7.43e-01h 1</I><I><BR></I><I>iter
objective inf_pr inf_du lg(mu) ||d||
lg(rg) alpha_du alpha_pr ls</I><I><BR></I><I> 70 3.0346243e+10
2.78e+04 6.92e-01 -1.9 7.51e+06 - 2.32e-01
7.54e-01h 1</I><I><BR></I><I> 71 2.2450431e+09 3.56e+03
4.34e-01 -2.0 3.62e+06 - 2.58e-01 8.72e-01h
1</I><I><BR></I><I> 72 4.0989559e+08 3.16e+03 5.04e+00
1.7 9.66e+05 - 7.13e-01 1.11e-01f
1</I><I><BR></I><I> 73 2.1918911e+07 3.24e+02 5.18e-01 -2.7
8.67e+05 - 9.19e-01 8.97e-01h
1</I><I><BR></I><I> 74 1.7622191e+07 4.05e+00 6.65e-03 -3.8
1.48e+05 - 9.78e-01 9.88e-01h
1</I><I><BR></I><I> 75 1.7618256e+07 2.33e-09 1.44e-02 -5.4
8.50e+03 - 9.90e-01 1.00e+00h
1</I><I><BR></I><I>MA27BD returned iflag=-4 and requires more
memory.</I><I><BR></I><I>Increase liw from 11075700 to 22151400 and la from
11620400 to 48600530 and factorize again.</I><I><BR></I><I> 76
1.7337765e+07 2.33e-09 2.23e-01 -7.4 5.68e+03 -
9.61e-01 1.00e+00h 1</I><BR>---<BR><B><BIG>my ipopt.opt
file:</BIG></B><BR><I>ma27_liw_init_factor
100.0</I><I><BR></I><I>ma27_la_init_factor
100.0</I><I><BR></I><I>ma27_meminc_factor
2.0</I><I><BR></I><I>constr_mult_init_max 0</I><I><BR></I><I>nlp_scaling_method
gradient-based</I><I><BR></I><I>linear_solver ma27</I><BR><BR>---<BR><B>Is the
reason too much var ?</B><B><BR>Can HSL_MA86 solve my problem?<BR></B><SPAN
style="WHITE-SPACE: normal; TEXT-TRANSFORM: none; WORD-SPACING: 0px; FLOAT: none; COLOR: rgb(67,67,67); FONT: bold 14px/24px arial,
sans-serif; DISPLAY: inline !important; LETTER-SPACING: normal; TEXT-INDENT: 0px; -webkit-text-stroke-width: 0px"><BR></SPAN><B>I
find the table from </B><B><A
href="http://www.hsl.rl.ac.uk/ipopt/">http://www.hsl.rl.ac.uk/ipopt/</A></B><B> </B><B>
:</B><BR><IMG alt=""
src="cid:48243F0ED7B9422DB16057DDE45A86D7@TKsamsung"><BR><BR><BR><BR><PRE class=moz-signature cols="72">--
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