Yea the issue is L3 cache size. 8MB cache/ 2MB problem size = 4 threads of 16 active. E5's are top dog for monero CPU mining.Is it me?
I think there are cheaper option to mine Monero other than buying a new AMD Ryzen.
Why AMD Ryzen H/s is lower than some Intel v3 CPU ? Lack of L3 cache?
Yea the issue is L3 cache size. 8MB cache/ 2MB problem size = 4 threads of 16 active. E5's are top dog for monero CPU mining.
Also, as an aside, there is a slight downside to this layout for single threaded tasks because no single thread can access more than 8LB of L3 cache.Uh, if you were only using 4 threads that's your problem. and why it performs at half what i expected...
Ryzen has 4 MB L2 and 16MB l3. it is 8MB L3 per cluster complex and there are 2 clusters. Not 8MB total.
You should definitely retest at 8 and 10 threads. and what the hell test some others too because you never know...
Architecture: x86_64
CPU op-mode(s): 32-bit, 64-bit
Byte Order: Little Endian
CPU(s): 16
On-line CPU(s) list: 0-15
Thread(s) per core: 2
Core(s) per socket: 8
Socket(s): 1
NUMA node(s): 1
Vendor ID: AuthenticAMD
CPU family: 23
Model: 1
Stepping: 1
CPU MHz: 3600.000
BogoMIPS: 7180.28
Virtualization: AMD-V
L1d cache: 32K
L1i cache: 64K
L2 cache: 512K
L3 cache: 8192K
NUMA node0 CPU(s): 0-15
@Spartus you are totally right (and I was tired.)
Ryzen is not displaying the correct value via lscpu:
Which was keeping the thread count too low. Updated the Ryzen 7 1800X numbers and now getting over 500H/s.Code:Architecture: x86_64 CPU op-mode(s): 32-bit, 64-bit Byte Order: Little Endian CPU(s): 16 On-line CPU(s) list: 0-15 Thread(s) per core: 2 Core(s) per socket: 8 Socket(s): 1 NUMA node(s): 1 Vendor ID: AuthenticAMD CPU family: 23 Model: 1 Stepping: 1 CPU MHz: 3600.000 BogoMIPS: 7180.28 Virtualization: AMD-V L1d cache: 32K L1i cache: 64K L2 cache: 512K L3 cache: 8192K NUMA node0 CPU(s): 0-15
I did not get as good of results with 10 and 16 was extremely poor.
Also, 133W while mining with 32GB (2x 16GB DIMMs) on the 1800X
True. The dual Xeon E5 setups are way ahead though. I think I have some of the 2x 12 core machines running at just under 900H/s at 160W each or so.Nice, a solid 4H/W-second. I think that easily beats my R9-290s for efficiency.
Good news,
I am thinking reducing numbers of worker since our Electric company just raised $$ this month.
For now, I am burning 26KW per day now to produce ~ 6KH/s.