The default value of the following options is 4. You have to change the default
value to the number that is greater than 4 to scale CU count.
parser.add_option("-u", "--num-compute-units", type="int", default=32,
help="number of GPU compute units")
parser.add_option("--cu-per-sqc", type="int", default=32, help="number of CUs" \
"sharing an SQC (icache, and thus icache TLB)")
parser.add_option("--simds-per-cu", type="int", default=32, help="SIMD units" \
"per CU")
parser.add_option('--cu-per-sa', type='int', default=32,
help='Number of CUs per shader array. This must be a '
'multiple of options.cu-per-sqc and options.cu-per-scalar')
________________________________
From: Tsungtai Yeh
Sent: Monday, August 6, 2018 9:19:14 AM
To: [email protected]
Subject: Re: [gem5-dev] How to increase the default CU counts in GCN_X86
gem5-apu?
I found I have to change the following options to increase the number of CUs in
GCN_X86.
--num-compute-units
--cu-per-sqc
--cu-per-scalar-cache
--simds-per-cu
--cu-per-sa
________________________________
From: Tsungtai Yeh
Sent: Saturday, July 28, 2018 8:40:30 PM
To: [email protected]
Subject: Re: [gem5-dev] How to increase the default CU counts in GCN_X86
gem5-apu?
I changed the default value of “—num-compute-units” to 8 in apu_se.py. I still
got the segmentation fault. The following is the trace from gem5 simulation.
The 8 CUs are initialized successfully, but get the failure during the
instruction fetching stage. — Tsung Tai
parser.add_option("-u", "--num-compute-units", type="int", default=8,
help="number of GPU compute units")
51620963000: system.cpu2.CUs0: trueWgSize[0] = 256
51620963000: system.cpu2.CUs0: trueWgSize[1] = 1
51620963000: system.cpu2.CUs0: trueWgSize[2] = 1
51620963000: system.cpu2.CUs0: trueWgSizeTotal = 256
51620963000: system.cpu2.CUs0: Free WF slots = 36, Mapped WFs = 0,
VGPR Availability = 0, SGPR Availability = 0
51620963000: system.cpu2.CUs1: trueWgSize[0] = 256
51620963000: system.cpu2.CUs1: trueWgSize[1] = 1
51620963000: system.cpu2.CUs1: trueWgSize[2] = 1
51620963000: system.cpu2.CUs1: trueWgSizeTotal = 256
51620963000: system.cpu2.CUs1: Free WF slots = 36, Mapped WFs = 0,
VGPR Availability = 0, SGPR Availability = 0
51620963000: system.cpu2.CUs2: trueWgSize[0] = 256
51620963000: system.cpu2.CUs2: trueWgSize[1] = 1
51620963000: system.cpu2.CUs2: trueWgSize[2] = 1
51620963000: system.cpu2.CUs2: trueWgSizeTotal = 256
51620963000: system.cpu2.CUs2: Free WF slots = 36, Mapped WFs = 0,
VGPR Availability = 0, SGPR Availability = 0
51620963000: system.cpu2.CUs3: trueWgSize[0] = 256
51620963000: system.cpu2.CUs3: trueWgSize[1] = 1
51620963000: system.cpu2.CUs3: trueWgSize[2] = 1
51620963000: system.cpu2.CUs3: trueWgSizeTotal = 256
51620963000: system.cpu2.CUs3: Free WF slots = 36, Mapped WFs = 0,
VGPR Availability = 0, SGPR Availability = 0
51620963000: system.cpu2.CUs4: trueWgSize[0] = 256
51620963000: system.cpu2.CUs4: trueWgSize[1] = 1
51620963000: system.cpu2.CUs4: trueWgSize[2] = 1
51620963000: system.cpu2.CUs4: trueWgSizeTotal = 256
51620963000: system.cpu2.CUs4: Free WF slots = 36, Mapped WFs = 0,
VGPR Availability = 0, SGPR Availability = 0
51620963000: system.cpu2.CUs5: trueWgSize[0] = 256
51620963000: system.cpu2.CUs5: trueWgSize[1] = 1
51620963000: system.cpu2.CUs5: trueWgSize[2] = 1
51620963000: system.cpu2.CUs5: trueWgSizeTotal = 256
51620963000: system.cpu2.CUs5: Free WF slots = 36, Mapped WFs = 0,
VGPR Availability = 0, SGPR Availability = 0
51620963000: system.cpu2.CUs6: trueWgSize[0] = 256
51620963000: system.cpu2.CUs6: trueWgSize[1] = 1
51620963000: system.cpu2.CUs6: trueWgSize[2] = 1
51620963000: system.cpu2.CUs6: trueWgSizeTotal = 256
51620963000: system.cpu2.CUs6: Free WF slots = 36, Mapped WFs = 0,
VGPR Availability = 0, SGPR Availability = 0
51620963000: system.cpu2.CUs7: trueWgSize[0] = 256
51620963000: system.cpu2.CUs7: trueWgSize[1] = 1
51620963000: system.cpu2.CUs7: trueWgSize[2] = 1
51620963000: system.cpu2.CUs7: trueWgSizeTotal = 256
51620963000: system.cpu2.CUs7: Free WF slots = 36, Mapped WFs = 0,
VGPR Availability = 0, SGPR Availability = 0
51620963000: system.cpu0.workload.drivers.device.dispatcher: kernel 0 failed to
launch
51620963000: system.cpu0.workload.drivers.device.dispatcher: Returning 0 Kernels
51620964000: global: WF[0][0]: Id28 reserved fetch buffer entry for PC =
0x7ffeebde9100
51620964000: global: CU7: WF[0][0]: Id28: Initiate fetch from pc:
140732855652608 0x7ffeebde9100
51620964000: global: CU7: WF[0][0]: Initiating fetch translation: 0x7ffeebde9100
gem5 has encountered a segmentation fault!
________________________________
From: Tsungtai Yeh
Sent: Friday, July 27, 2018 7:20:55 AM
To: [email protected]
Cc: [email protected]
Subject: [gem5-dev] How to increase the default CU counts in GCN_X86 gem5-apu?
I tried to increase the CU counts to 32 in the gem5-apu. However, I found I
could not only increase "--num-compute-units" default count (4). Do you know
any other parameters I also need to change when increasing the CU counts? Thank
you.
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