The effects of network contention on processor allocation strategies

Job2(2,0)(2,1)

(2,2)

(2,3)(2,0)(2,1)

Job2(2,2)

(2,3)Job3(1,0)

(1,1)

(1,2)

(1,3)

(1,0)

(1,1)

(1,2)

(1,3)

Job1(0,0)

(0,1)

(0,2)

(0,3)

(0,0)

Job1(0,1)

(0,2)

(0,3)

(3,0)(3,1)(3,2)(3,3)Job3(2,0)(2,1)Job2(2,2)(2,3)(1,0)(1,1)(1,2)(1,3)Job1(0,0)(0,1)(0,2)Job3(0,3)C00000000100100011010001010110011110001001101010111100110111101111G0C1G1C2G2C3G3C40000000100100011010001010110011110001001101010111100110111101111Other Functional UnitProcessorMemoryInternal InterconnectNetworkAdapterTo Switch PortC0000000010010G0C1G1C2G2C3G3C40000000100100011010001010110011110001001101010111100110111101111Job1001101000101*0110*0111100010011010**Job2101111001101*1110*1111***: Unused processorC000000001001000110100010101100111G0C1G1C2G2C3G3C40000000100100011010001010110011110001001101010111100110111101111Job1Unused10001001101010111100Job2110111101111C000000001G0C1G1C2G2C3G3C40000000100100011010001010110011110001001101010111100110111101111Job10010001101000101Job30110011110001001Job21010101111001101Job31110111101Job 12301Job 12301230101Job 123012323Network45Job 2676745Job 26745Network45Network45Job 267456767Processor AProcessor BProcessor AProcessor B1111Computation2222Sending3IdleReceiving3344344(a) No Contention in the network(b) Contention along one of the channelstcomptsendtnettrecvtcomptcomptsendtnettrecvtcomptcommC0G0C1G1C2G2C3G3C400000000Job1000100010010001000110011010001000101010101100110Job2011101111000100010011001101010101011101111001100Job1110111011110111011111111Job1Job2ContentionJob2(3,0)(3,1)(3,2)(3,3)(2,0)(2,1)(2,2)(2,3)(1,0)(1,1)(1,2)(1,3)(0,0)(0,1)(0,2)(0,3)Job1ExecTime20000Random traffic pattern 160001002004001200080080004000012Communication Frequency345678ExecTime20000Ring Traffic Pattern160001002004001200080080004000012Communication Frequency345678ExecTime20000Comparison with ideal case 16000RandomIdealRing12000t_send = 40080004000012Communication Frequency345678ExecTime45000Random traffic pattern 400003500030000250002000015000100100002005000400800012Communication Frequency345678ExecTime45000Ring Traffic Pattern400003500030000250002000015000100100002005000400800012Communication Frequency345678ExecTime45000Compairson with ideal case 4000035000t_send = 4003000025000200001500010000RandomIdealRing5000012Communication Frequency345678ExecTime20000Random traffic pattern 160001002004001200080080004000012Communication Frequency345678ExecTime20000Ring Traffic Pattern160001002004001200080080004000012Communication Frequency345678ExecTime20000Comparison with ideal case 16000RandomIdealRing12000t_send =40080004000012Communication Frequency345678ExecTime40000Random traffic pattern 3500030000250002000015000100100002005000400800012Communication Frequency345678ExecTime35000Ring Traffic Pattern30000250002000015000100001005000200400080012Communication Frequency345678ExecTime40000Compairson with ideal case3500030000t_send = 40025000200001500010000Random5000IdealRing012Communication Frequency345678ExecTime20000Random 15000100005000Frag-freeContention-freeContention012Communication Frequency345678ExecTime20000Random 15000100005000Contention-freeContentionFrag-free012Communication Frequency345678ExecTime50000Random 40000300002000010000Frag-freeContention-freeContention012Communication Frequency345678ExecTime50000Pair Traffic Pattern40000300002000010000Frag-freeContention-freeContention012Communication Frequency345678ExecTime50000Ring Traffic Pattern40000300002000010000Frag-freeContention-freeContention012Communication Frequency345678ExecTime45000Random 400003500030000250002000015000100005000Contention-freeContentionFrag-free012Communication Frequency345678ExecTime45000Pair Traffic Pattern40000350003000025000200001500010000Frag-free5000Contention-freeContention012Communication Frequency345678ExecTime45000Ring Traffic Pattern40000350003000025000200001500010000Frag-free5000Contention-freeContention012Communication Frequency345678