Created: 8/3/1994

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Special Intelligence Report

Office of Scientific two' WeaponsAugust IW4

CHINA: Theomputer and Nuclear-Related Research*poM,.rti4Ued woek look placell-wnr ot theBeumg SatsomatMeteorologicalCenter


.nivhes software testing by Chinese

nuclear weaponsn preparation for tbe receipt of their own The indigenously developed Calaxy-ll is an adequate huh- compute,for meteorology and nuclear weapons modeling far short of current US arid Japanese

performance levels.


, the secotxibe budr theil..ttd instituiesha whereogged, ande - be deliveredAPCMNov,4

vla flamirrl thr fiaWM lew

nasi lour to six houn per day. I


portion* of iheir BatKU( modeling hydrocode. on the NMC Calaxy-ll to m*

M* learn in ad ranee how to optmtu useewre the,eUeeey and can run full nucuJwlaturZn 7helTnJaemlies

Reported Nuclear-Related AdivUici at

APCM researchers could have uwd the Galaxy-JJ it NMC forclear designwork. ThisisUsthhety.butpossibU. IV NMCGalaxyislocatedrna relatively open institute and panetwork with many other computers Chinese nuclear modeling on Ihe machine at NMC would run some ml of detection by nonnucUar researchers, including foreign persoumet Nevertheless, even part-time computational access to the Galaxy at NMC could help IATCM designers acceUrotr progress on theirprvjects. and they might judge the risks of detection to he acceptable.

If tht most pmbable .eenarso is correct and the Chinese nuclear modelers were running Us, program, (or code fragments) primarily lo gam experience with lhe Galaxy-It. then their use of SMC computers would probaNy end when IAPCM reeereet its ownn the other hand.

tare clearly been used to support

Chinese nuclear capons research.ray computer al SMC were diverted to suchould be ofsignificantlyufy than thr Galaxylt to thr Chinese in their nuclear compuiotivns Safeguard, could detect, but not pre vml.n place.


NMC researchers have been using an indigenously developed Chinesethe Galaxy lUmee October IW, according to open Chinese publications'* on an NMC rscrwotfc wherefront-ended by a

prrpuw and car, share datacr US and Oiirese sy.term Development of theompwec begaaational Defense Uruvexsuy of Science and Technology fas Changsha. Ir jog* the NMC contacted to acquire the first prod jcMnmodelor use in ro medium raw wtatSer forecast^Theke has been relatively slow as compared -irA progress in thr Western high-performanceindustry during the past decade.

Thes. acceding in publishedour-proccsiur computerlock rate ofanoseconds (equivalentlowei evenvintagend far behindb-end Japanese and Cray systems iwinch are in the 4nsccording to the Chinese press

theJotal ihwed main memory sizecgaBytca- better than a

ut much less lhan current Wcatern supercomputers. The Chinese State that theas two independenicgabii-per-sccond mput/output <VO)

which if true is very slow and likelygnificam limitation for users who oeed to move large data seu throuch che system. Overall, the Chinese have claimed thai the Galaayll canillionit tloatine-point operations per second

WMi;n.o. rf-K* rare, wetf bandwutth. the four.proeetse,hole prvUbty cm* achieve ami,theoretical*)0 million theoreticalttcend (MTOPSi. Thi Galaxy-ll's performance thus falls far short ofWestern supercomputers; tt is comparable to that oftodayswoetslatsons, mow available in the West for under SlOOfiOO.

The Galaxy-ri is an adequate computer for medium-range numerical wealher forecasting, but Chinese meteorologist almost certainly would prxfer la have faster, rtluibte, easier-to-use Cray iy items Men computational weather centers around the world use Cray sysierm, socompaQble hardware would enable ihc Chinese to share software and algorithms much more easily wi* theirapanese supercomputer wouldecond choice for meteorological applications, but signtficandy behind aCrayim utility and requiring addUional utrettment of time and software development resources. [

The Chinese have suted openlythey plan lo build a

successor machine, the Galaxy-Ill. lnrsratiMCornmRei is toassively panilel systemrocessors initially, and will ultimately use uphousand processors. It wxUprobably rely heavilyon Western components. The scheduled date foi completion of the funllnd the ultimate design performance is claimed to be many billion* of floatlng-paim operaiions per second The slow production tthedula of the Galaxy-Ill assures that, even tf it is finished on time, it will beeelipsedby Western advanced workstations and will not be competitive withfuture VS or Japanese supercomputers. C

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