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lihb734鐵桿木蟲(chóng) (職業(yè)作家)
站在計(jì)算化學(xué)入門(mén)的門(mén)檻上
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[交流]
【求助】高斯的內(nèi)存分配方式 已有4人參與
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今天在CCL上看到一帖子: 問(wèn)題如下: During submission of input files to Gaussian setup I have allocated the memory %Mem=3GB (4 GB RAM installed on computer) but that is not used and only 98MB to 100MB is used which may be the default amount of memory to be used. Please suggest solution My input file is like this #!/bin/csh g09 < %Chk=Butanol %nproc=2 %mem=3GB # opt freq b3lyp/6-31g geom=connectivity maxdisk=50GB Butanol 0 2 好心人回復(fù)如下: I'm using Gaussian 03 not 09, but I suppose settings are the same. Now if I'm not wrong, %mem stands for the memory per core. Because %nproc=2 in your case, Gaussian looks for 2 x 3 GB = 6 GB of memory, but your total physical memory is 4 GB. So, that's why it used only 98-100 MB (default memory setting is 6 MW which is roughly equal to 96 MB). Try %mem=1500MB, this should work. With %nproc=2, this means that Gaussian will use 3GB of memory. Also, try not to spend all of the memory for Gaussian, keep some for the operating system and other stuff. 現(xiàn)在我自己想確認(rèn)的是,%mem指認(rèn)的內(nèi)存是對(duì)每個(gè)CPU的,還是在平行情況下指認(rèn)的總內(nèi)存;內(nèi)存的分配方式在G03和G09中有變化嗎?謝謝軟件硬件高手指教。 |

至尊木蟲(chóng) (職業(yè)作家)
鐵桿木蟲(chóng) (小有名氣)
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根據(jù)我的經(jīng)驗(yàn), %mem應(yīng)該指的是并行計(jì)算條件下的總內(nèi)存, 單個(gè)CPU分的內(nèi)存為%mem/%nproc 如果某個(gè)link不能并行, 只能單CPU運(yùn)行的話(huà), 最多能使用的內(nèi)存也就只有%mem/%nproc g09里與g03相同 [ Last edited by ybyygu on 2010-7-16 at 19:59 ] |
鐵桿木蟲(chóng) (職業(yè)作家)
站在計(jì)算化學(xué)入門(mén)的門(mén)檻上

金蟲(chóng) (著名寫(xiě)手)
不要用QQ問(wèn)我東西

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