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zhoulm338

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科研资料 Gaussian

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chembetsey

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【答案】应助回帖

感谢参与,应助指数 +1
引用回帖:
6楼: Originally posted by zhoulm338 at 2012-07-28 10:46:48
真是灰常感谢呀,我再来试一试哈......,对啦,那如果转换成MW,基本上需要多大呢,我对这个不是十分清楚,再次表示感谢哈...

Controlling Memory Usage

The %Mem command controls the amount of dynamic memory to be used by Gaussian. By default, 256 MB (32MW) are used. This can be changed to n double-precision words by specifying:

%Mem=n

For example, the following command sets memory use to 320 million bytes:

%Mem=40000000

The value given to %Mem may also be followed by KB, KW, MB, MW, GB or GW (no intervening spaces) to denote other units. For example, the following command also sets the amount of dynamic memory to 1 GB:

%Mem=1GB

Even larger allocations may be needed for very large direct SCF calculations, at least 3N2 words, where N is the number of basis functions.

Warning: Requesting more memory than the amount of physical memory actually available on a computer system will lead to very poor performance.

If Gaussian is being used on a machine with limited physical memory, so that the default of 256 MB is not available, the default algorithms as well as the default memory allocation should be set appropriately during installation. See Efficiency Considerations for more details on using Gaussian efficiently.

---From Gaussian manual
www.gaussian.com/g_tech/g_ur/m_running_w.htm
9楼2012-07-28 11:08:39
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xyz7819227

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【答案】应助回帖

感谢参与,应助指数 +1
你的思路基本是对的,只是你说的计算碘的opt和freq那个没看懂,你可以把你出现问题的输入文件贴出来,这样别人才能看懂,问题才能得到很好的解决
海纳百川,有容乃大
2楼2012-07-27 21:22:32
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zhoulm338

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3楼2012-07-27 22:17:15
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chembetsey

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3楼: Originally posted by zhoulm338 at 2012-07-27 22:17:15
%chk=HgBrBr freq.chk
%mem=12MW
%nproc=1
#p opt=(ts,calcfc)mp2/gen pseudo=read

HgBrBr freq

0 1
Br
Hg            1              R1     
Br            1              R2      2         ...

提示信息已经说明了为什么和解决办法了:
Actual    scratch disk usage=   299581312 words.
Not enough memory for best loop length:
LenScr=    11834412 LenERI=     5727590 MOrb=  27 NBasFn= 185
NDiv=   34225 NHalf=   51 MxRSFn= 100 RSMin=  100 GoodMem=    12572590
Increasing memory by up to      738178 words may improve performance.

Not enough memory to run at all:  LenERI=     5727590
Increase memory by      738178 words.


Sample Text
4楼2012-07-28 01:28:40
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