Editing pezy/pezy-scx/pezy-sc2

{{pezy title|PEZY-SC2}}
{{mpu
|future=Yes
|name=PEZY-SC2
|no image=Yes
|designer=PEZY
|manufacturer=TSMC
|model number=PEZY-SC2
|market=Supercomputer
|first announced=2015
|first launched=2017
|family=PEZY-SCx
|frequency=1,000 MHz
|process=16 nm
|technology=CMOS
|die area=620 mm²
|core count=2,048
|thread count=16,384
|power=180 W
|average power=130 W
|v core=0.8 V
}}
'''PEZY-SC2''' ('''PEZY Super Computer 2''') is a third generation [[many-core microprocessor]] developed by [[PEZY]] and introduced in early 2017. This chip, which operates at 1 GHz, incorporates 2,048 cores dissipating 180 W. The PEZY-SC2 powers the [[ZettaScaler]]-2.x series of supercomputers. 

== Overview ==
Introduced by [[PEZY]] along with their second-generation [[ZettaScaler]]-2.0 supercomputer series, the SC2 incorporates 2,048 cores along with 8-way [[simultaneous multithreading|SMT]] support for a total of 16,384 threads, twice as many cores as {{\\|PEZY-SC|its predecessor}}. The PEZY-SC2 powers many of the top [[Green500]] most efficient supercomputers with upward of 14 GFLOPS/watt in performance.

Operating at 1 GHz, the PEZY-SC2 has a peak performance of 8.192 TFLOPS (single-precision) and 4.1 TFLOPS (double-precision) while consuming around 180 Watts. The PEZY-SC2 is designed using over 2.4 billion gates and is manufactured on [[TSMC]]'s [[16 nm process|16FF+ process]].
{{#set:
| peak flops (half-precision)   = {{#expr:1000000000 * 8 * 2048}} FLOPS
| peak flops (single-precision) = {{#expr:1000000000 * 4 * 2048}} FLOPS
| peak flops (double-precision) = {{#expr:1000000000 * 2 * 2048}} FLOPS
}}
In attempt to increase adaptability in the field of deep learning and AI as well as to increase throughput for specialized workloads, the PEZY-SC2 introduced support for 16-bit half precision floating point support. At 1 GHz, the SC2 can peak at 16.4 TFLOPS for half precision.

=== Architecture ===
Managing the tiny PEZY cores are six {{mips|P-Class}} {{mips|P6600}} [[MIPS]] processors. Previously, the {{\\|PEZY-SC}} relied on two lightweight {{arm|ARM9|ARM926|l=arch}} [[physical core|cores]] that proved to be too much of a performance bottleneck. The SC2 got rid of the four "Prefecture" units that incorporated 256 cities along with 2 MiB of L3 cache. Instead, the SC2 now has 40 MiB of shared [[last level cache]] shared not only by all the cities, but also by the MIPS cores. In order to improve performance further, the MIPS cores and the PEZY cores now share the same address space, reducing data transfer overhead. It's worth noting that the use of powerful MIPS cores mean they no longer require to rely on an external [[Intel]] {{intel|Xeon E5}} host processor.


: [[File:pezy-sc2 main block.svg|750px]]

== Cache ==
The SC2 a [[hexa-core]] MIPS {{mips|P6600}} process which has its own separate cache:

{{cache size
|l1 cache=768 KiB
|l1i cache=384 KiB
|l1i break=6x64 KiB
|l1i desc=4-way set associative
|l1d cache=384 KiB
|l1d break=6x64 KiB
|l1d desc=8-way set associative
|l2 cache=2 MiB
|l2 break=1x2 MiB
|l2 desc=8-way set associative
}}

The SC2 integrates a multi-level cache hierarchy:

{{cache size
|l1 cache=12 MiB
|l1i cache=8 MiB
|l1d cache=4 MiB
|l2 cache=12 MiB
|l3 cache=40 MiB
|l3 break=1x40 MiB
|l3 desc=shared LLC
}}

Additionally, there is another 40 MiB consisting of 20 KiB per PE of scratch pad memory. This was increased from 16 KiB in the {{\\|Pezy-SC}}.

== Memory controller ==
For main memory, the PEZY-SC2 supports 4 channels of 64-bit DDR4-3200 memory with ECC support for a total aggregated bandwidth of 95.37 GiB/s
{{memory controller
|type=DDR4-3200
|ecc=Yes
|max mem=123 GiB
|controllers=4
|channels=4
|width=64 bit
|max bandwidth=95.37 GiB/s
|bandwidth schan=23.84GiB/s
|bandwidth dchan=47.68 GiB/s
|bandwidth qchan=95.37 GiB/s
}}

In addition to main memory bandwidth, the PEZY-SC2 supports Wide-IO with a width of 1,024 bit. The SC2 uses [[ThruChip Interface (TCI)]], a wireless near-field inductive coupling technology, in order to communicate with the TCI-DRAM chips which are packaged together. The SC2 features four TCI-DRAM interfaces, each providing a maximum bandwidth of 500 GB/s for a total aggregated bandwidth of 2 TB/s.

{{memory controller
|wide-io clock=2,000 MHz
|wide-io width=1,024 bit
|channels=4
|max bandwidth=1.863 TiB/s
}}

== Expansions ==
The SC2 upgraded the PCIe interface to Gen4, supporting up to 64 GB/s. The number of lanes remain unchanged from the {{\\|PEZY-SC}}, at 32.
{{expansions main
|
{{expansions entry
|type=PCIe
|pcie revision=4.0
|pcie lanes=32
|pcie config=4x8
|pcie config 2=2x16
}}
}}
== See also ==
* [https://fuse.wikichip.org/news/191/the-2048-core-pezy-sc2-sets-a-green500-record/ The 2,048-core PEZY-SC2 sets a Green500 record - WikiChip Fuse]
Has subobject "Has subobject" is a predefined property representing a container construct and is provided by Semantic MediaWiki.	PEZY-SC2 - PEZY#pcie +
base frequency	1,000 MHz (1 GHz, 1,000,000 kHz) +
core count	2,048 +
core voltage	0.8 V (8 dV, 80 cV, 800 mV) +
designer	PEZY +
die area	620 mm² (0.961 in², 6.2 cm², 620,000,000 µm²) +
family	PEZY-SCx +
first announced	2015 +
first launched	2017 +
full page name	pezy/pezy-scx/pezy-sc2 +
has ecc memory support	true + and false +
instance of	microprocessor +
l1$ size	768 KiB (786,432 B, 0.75 MiB) + and 12,288 KiB (12,582,912 B, 12 MiB) +
l1d$ description	8-way set associative +
l1d$ size	384 KiB (393,216 B, 0.375 MiB) + and 4,096 KiB (4,194,304 B, 4 MiB) +
l1i$ description	4-way set associative +
l1i$ size	384 KiB (393,216 B, 0.375 MiB) + and 8,192 KiB (8,388,608 B, 8 MiB) +
l2$ description	8-way set associative +
l2$ size	2 MiB (2,048 KiB, 2,097,152 B, 0.00195 GiB) + and 12 MiB (12,288 KiB, 12,582,912 B, 0.0117 GiB) +
l3$ description	shared LLC +
l3$ size	40 MiB (40,960 KiB, 41,943,040 B, 0.0391 GiB) +
ldate	3000 +
manufacturer	TSMC +
market segment	Supercomputer +
max memory bandwidth	95.37 GiB/s (97,658.88 MiB/s, 102.403 GB/s, 102,402.758 MB/s, 0.0931 TiB/s, 0.102 TB/s) + and 1,907.712 GiB/s (1,953,497.088 MiB/s, 2,048.39 GB/s, 2,048,390.163 MB/s, 1.863 TiB/s, 2.048 TB/s) +
max memory channels	4 +
model number	PEZY-SC2 +
name	PEZY-SC2 +
peak flops (double-precision)	4,096,000,000,000 FLOPS (4,096,000,000 KFLOPS, 4,096,000 MFLOPS, 4,096 GFLOPS, 4.096 TFLOPS, 0.0041 PFLOPS, 4.096e-6 EFLOPS, 4.096e-9 ZFLOPS) +
peak flops (half-precision)	16,384,000,000,000 FLOPS (16,384,000,000 KFLOPS, 16,384,000 MFLOPS, 16,384 GFLOPS, 16.384 TFLOPS, 0.0164 PFLOPS, 1.6384e-5 EFLOPS, 1.6384e-8 ZFLOPS) +
peak flops (single-precision)	8,192,000,000,000 FLOPS (8,192,000,000 KFLOPS, 8,192,000 MFLOPS, 8,192 GFLOPS, 8.192 TFLOPS, 0.00819 PFLOPS, 8.192e-6 EFLOPS, 8.192e-9 ZFLOPS) +
power dissipation	180 W (180,000 mW, 0.241 hp, 0.18 kW) +
power dissipation (average)	130 W (130,000 mW, 0.174 hp, 0.13 kW) +
process	16 nm (0.016 μm, 1.6e-5 mm) +
supported memory type	DDR4-3200 +
technology	CMOS +
thread count	16,384 +