ecs.c6a.4xlarge by Alibaba Cloud

ecs.c6a.4xlarge is a ecs.c6a family (16 vCPUs, 32 GiB RAM, 0 GB storage) server offered by Alibaba Cloud with 16 vCPUs, 32 GiB of memory and 0 GB of storage. The pricing starts at 0.2033 USD per hour.
16 vCPU
32 GiB Memory
Spare SCore
6,127
(All-cores)
765
(Single-core)

Specifications

Server Metadata

Vendor ID
alicloud
Name
ecs.c6a.4xlarge
Description
ecs.c6a family (16 vCPUs, 32 GiB RAM, 0 GB storage)
Family
ecs.c6a
Hw Virt
Average Time To Start
10.5
Status
active
Observed At
2026-10-28T16:51:40.648918

Availability

REGION / IDSPOTONDEMAND
Guangzhou (CN) / cn-guangzhou
0.2033 USD/h 0.363 USD/h
Beijing (CN) / cn-beijing
- 0.363 USD/h
Hangzhou (CN) / cn-hangzhou
- 0.363 USD/h
Shenzhen (CN) / cn-shenzhen
- 0.363 USD/h

Processor

vCPUs
16
Hypervisor
KVM
CPU Allocation
Dedicated
CPU Cores
8
CPU Speed
2.6 GHz
CPU Architecture
x86_64
CPU Manufacturer
AMD
CPU Family
EPYC
CPU Model
7H12
CPU L1D Cache
32 KiB
CPU L1D Cache Total
256 KiB
CPU L1I Cache
32 KiB
CPU L1I Cache Total
256 KiB
CPU L2 Cache
512 KiB
CPU L2 Cache Total
4 MiB
CPU L3 Cache
16 MiB
CPU L3 Cache Total
32 MiB
CPU Flags
fpu, vme, de, pse, tsc, msr, pae, mce, cx8, apic, sep, mtrr, pge, mca, cmov, pat, pse36, clflush, mmx, fxsr, sse, sse2, ht, syscall, nx, mmxext, fxsr_opt, pdpe1gb, rdtscp, lm, constant_tsc, rep_good, nopl, nonstop_tsc, cpuid, extd_apicid, tsc_known_freq, pni, pclmulqdq, monitor, ssse3, fma, cx16, sse4_1, sse4_2, x2apic, movbe, popcnt, aes, xsave, avx, f16c, rdrand, hypervisor, lahf_lm, cmp_legacy, cr8_legacy, abm, sse4a, misalignsse, 3dnowprefetch, osvw, topoext, perfctr_core, ssbd, ibpb, stibp, vmmcall, fsgsbase, tsc_adjust, bmi1, avx2, smep, bmi2, rdseed, adx, smap, sha_ni, xsaveopt, xsavec, xgetbv1, arat
Ecpus
8
Scalability
50

System Resources and Accelerators

MEMORY
Memory Amount
32 GiB
Memory Amount Actual
32 GiB
ACCELERATORS
Accelerator Count
0
Accelerator Memory Min
0 MiB
Accelerator Memory Total
0 MiB
Accelerators
    STORAGE
    Storage Size
    0 GB
    Storages
      NETWORK
      Network Speed Baseline
      5 Gbps
      Inbound Traffic
      0 GB/month
      Outbound Traffic
      0 GB/month
      IPv4
      0

      CPU and System Topology

      Server Description

      A dedicated AMD-powered compute instance delivering balanced multi-core performance and 1:2 vCPU-to-RAM density for parallelized workloads.

      Compute OptimizedGeneral Purpose

      Alibaba Cloud ecs.c6a.4xlarge is a compute-optimized instance featuring 16 dedicated vCPUs and 32.0 GB of RAM, powered by an AMD EPYC 7H12 processor at 2.6 GHz. Operating on the KVM hypervisor, this x86_64 server lacks local storage and GPUs, relying on a 5 Gbps baseline network. Performance benchmarks indicate a distinct tradeoff: single-core stress-ng performance is weak, ranking in the bottom 10%, whereas multi-core CPU, Geekbench, and PassMark scores consistently align with the middle 50% average. Memory bandwidth also drops for large, uncached blocks, though cached small-block reads remain average. This hardware profile is qualitatively cost-efficient for parallelized, compute-bound workloads such as multi-threaded software compilation, static web serving, and database operations that do not demand high single-thread performance or massive memory-to-CPU ratios.

      Economics

      Average Price per Region

      Prices per Zone

      Lowest Prices

      Performance

      Workload Profiles

      0.64Score
      Precomputed compound score for Cache Intensive workloads. A weighted average (geometric mean) of benchmark scores compared to their medians: score = ∏ (x_i / m_i)^(w_i / Σw). The score of 1.0 represents a synthetic baseline server with the median performance of each component benchmark; 0.5 means roughly half the performance; and 2.0 means twice the performance of that reference profile. Component weights: 50% Redis RPS (pipeline=1, SET), 20% Redis RPS (pipeline=16, SET), 10% PassMark Memory Mark (composite), 10% Memory bandwidth (read, 16 MB ~ L3), 10% PassMark single-thread CPU. Rationale for component selection: In-memory key-value store workload, mixing direct Redis performance metrics with memory speed and latency benchmarks, and single-core CPU performance profiles.
      Component Score Weight Impact
      Raw Reference Normalized Target Actual
      Redis RPS (pipeline=1, SET) 1,161,881 ops/sec 1,919,289 ops/sec 0.63 50.00% 50.00% -21.00%
      Redis RPS (pipeline=16, SET) 8,011,539 ops/sec 11,728,058 ops/sec 0.67 20.00% 20.00% -7.70%
      PassMark Memory Mark (composite) 2,539 2,416 1 10.00% 10.00% 0.00%
      Memory bandwidth (read, 16 MB ~ L3) 30,509 MB/sec 108,466 MB/sec 0.28 10.00% 10.00% -12.00%
      PassMark single-thread CPU 2,128 Mops/s 2,365 Mops/s 0.88 10.00% 10.00% -1.30%

      Memory Bandwidth

      Compression

      OpenSSL

      Geekbench Single-Core

      Score: 1,305

      Geekbench Multi-Core

      Score: 7,305

      Passmark CPU Scores

      BENCHMARKSCORE
      Mark
      		 18,932
      Compression
      		 240,571
      Encryption
      		 17,063
      Extended Instructions
      		 14,370
      Floating Point Maths
      		 32,192
      Integer Maths
      		 53,901
      Physics
      		 1,341
      Prime Numbers
      		 74
      Single Threaded
      		 2,128
      String Sorting
      		 30,071

      Passmark Memory Scores

      BENCHMARKSCORE
      Memory Mark
      		 2,539
      Database Operations
      		 5,108
      Memory Latency
      		 49
      Memory Read Cached
      		 24,417
      Memory Read Uncached
      		 12,216
      Memory Write
      		 11,341

      Stress-ng Stressors

      CPU integerSingleMultiScaling
      atomic
      		 284.91 345.9 1.21×
      bitops
      		 120,470 1,214,385 10.08×
      branch
      		 152,773 2,108,015 13.80×
      funccall
      		 498.55 5,380 10.79×
      funcret
      		 14,650 165,236 11.28×
      hash
      		 130,747 1,640,571 12.55×
      intmath
      		 19,383 170,269 8.78×
      nop
      		 235,767 1,906,099 8.08×
      prime
      		 340,017 3,646,734 10.73×
      rotate
      		 59,768 496,606 8.31×
      str
      		 662,689 7,777,705 11.74×
      wcs
      		 504,816 4,775,563 9.46×
      CryptographySingleMultiScaling
      crypt
      		 2,841 24,395 8.59×
      CompressionSingleMultiScaling
      jpeg
      		 620.74 6,766 10.90×
      zlib
      		 62.72 713.71 11.38×
      HypervisorSingleMultiScaling
      clock
      		 18,733 167,465 8.94×
      clone
      		 258.12 1,848 7.16×
      context
      		 3,046 41,450 13.61×
      cpu-sched
      		 71.36 1,049 14.70×
      eventfd
      		 42,296 657,142 15.54×
      fault
      		 7,825 81,071 10.36×
      fork
      		 2,961 31,747 10.72×
      getrandom
      		 35,716 392,412 10.99×
      hrtimers
      		 812,851 1,168,135 1.44×
      mprotect
      		 634,924 2,430,201 3.83×
      mtx
      		 36,510,210 738,178,819 20.22×
      munmap
      		 2,069 23,564 11.39×
      null
      		 372,594 4,824,446 12.95×
      pipe
      		 1,461,487 4,954,362 3.39×
      priv-instr
      		 383,644 4,981,131 12.98×
      resched
      		 4,007,355 1,547,772 0.39×
      switch
      		 149,246 1,532,561 10.27×
      timermix
      		 148,482 2,171,555 14.63×
      tlb-shootdown
      		 12,252 43,282 3.53×
      tsc
      		 655,126 10,083,537 15.39×
      usersyscall
      		 275,207 3,604,021 13.10×
      vdso
      		 62,715,459 669,665,015 10.68×
      vfork
      		 19,657 125,124 6.37×
      x86syscall
      		 4,529,402 58,360,364 12.88×
      yield
      		 7,811,042 8,329,718 1.07×
      zero
      		 1,987,982 25,059,675 12.61×
      CPU float/SIMDSingleMultiScaling
      eigen
      		 12,397 116,602 9.41×
      expmath
      		 2,778 34,880 12.56×
      fma
      		 742,783 9,318,543 12.55×
      fp
      		 208.16 2,494 11.98×
      fractal
      		 6.4 80.26 12.54×
      hyperbolic
      		 3,632 43,601 12.00×
      logmath
      		 4,095 47,905 11.70×
      matrix
      		 2,622 39,451 15.05×
      matrix-3d
      		 134.92 994.1 7.37×
      monte-carlo
      		 161.33 2,065 12.80×
      mpfr
      		 1,270 13,205 10.40×
      powmath
      		 1,338 17,253 12.89×
      trig
      		 1,553 19,006 12.24×
      veccmp
      		 17,017 165,344 9.72×
      vecfp
      		 1,386 17,069 12.32×
      vecmath
      		 3,353 43,315 12.92×
      vecshuf
      		 478.64 4,771 9.97×
      vecwide
      		 26,463 251,844 9.52×
      AlgorithmsSingleMultiScaling
      bitonicsort
      		 7 68.4 9.77×
      bsearch
      		 228.11 2,288 10.03×
      bubblesort
      		 0.8 6.4 8.00×
      fibsearch
      		 263.94 2,690 10.19×
      heapsort
      		 8.6 96.8 11.26×
      hsearch
      		 5,456 54,842 10.05×
      insertionsort
      		 6.6 63.2 9.58×
      malloc
      		 2,412,905 26,436,125 10.96×
      mcontend
      		 116.24 2,073 17.84×
      mergesort
      		 25.8 315.59 12.23×
      qsort
      		 16 209 13.06×
      skiplist
      		 5,531 70,633 12.77×
      tree
      		 1.6 9.6 6.00×
      MemorySingleMultiScaling
      cache
      		 458,454 913,246 1.99×
      cachehammer
      		 505,570 5,960,270 11.79×
      cacheline
      		 47.34 795.7 16.81×
      l1cache
      		 192.72 1,543 8.01×
      memcpy
      		 355.88 2,995 8.42×
      memrate
      		 1.75 3.02 1.73×
      memthrash
      		 115.25 275.81 2.39×
      ptr-chase
      		 27,957,287 113,309,956 4.05×
      spinmem
      		 131.99 459.49 3.48×
      stream
      		 150.75 4,085 27.10×
      vm
      		 54,286 292,559 5.39×

      Stress-ng Raw Scores

      Stress-ng Relative Multicore Performance

      Static Web Server

      Redis

      Alternatives

      Servers of the Same Family

      INSTANCEvCPUsMEMORYAccelerators
      ecs.c6a.large 24 GiB0
      ecs.c6a.xlarge 48 GiB0
      ecs.c6a.2xlarge 816 GiB0
      ecs.c6a.8xlarge 3264 GiB0
      ecs.c6a.16xlarge 64128 GiB0
      ecs.c6a.32xlarge 128256 GiB0

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      ecs.c6a.4xlarge FAQs