VG7842RT-7152G
VG7842RT-7152G
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主營產(chǎn)品:Schneider ,Foxboro,GE,Allen-Bradley,Siemens等各類工控產(chǎn)品,
歡迎來電!
聯(lián)系人:溫工
電話:13395031610
QQ:291572257
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在使用全局共享內(nèi)存時,由于對內(nèi)存的訪問是獨占型的,所以存在仲裁問題。而反射內(nèi)存通過向每個節(jié)點機提供一套相同的數(shù)據(jù)備份來避免這一問題,這使得各節(jié)點可以并發(fā)的訪問相同的內(nèi)容,不再需要考慮仲裁的問題,訪問反射內(nèi)存卡的內(nèi)存與訪問自身的內(nèi)存沒有差別。各節(jié)點間的數(shù)據(jù)一致性是由反射內(nèi)存保證的,對應用軟件是透明的。另外,反射內(nèi)存卡的安裝也十分簡單,只需將反射內(nèi)存卡插在機器主板的一個可用槽口上,再將各臺計算機通過光纖網(wǎng)或扁平數(shù)據(jù)線連接在一起就可以了。不需要額外的驅(qū)動程序
獨立于操作系統(tǒng)和處理機
反射內(nèi)存卡最初是在 VME 總線上使用的,現(xiàn)在已經(jīng)可以在 PCI 、 PMC 、 Compact PCI 、等多種總線上使用了,這就可以將 ALPHA 、 Power PC 、 Macintosh 、奔騰等計算機通過反射內(nèi)存實時網(wǎng)絡連接在一起,組成一個集群系統(tǒng),而不需考慮操作系統(tǒng)和處理機的問題。
這樣做的唯一問題是 不同計算機的字節(jié)排序可能會不同,不同的機器間通訊時,需要作字節(jié)排序的轉(zhuǎn)換工作,在 GE FUNAC 的反射內(nèi)存中,這一轉(zhuǎn)換由反射內(nèi)存板自動完成,不需要軟件開銷。
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