B1s by Microsoft Azure

B1s is a BS family [Premium Storage capable] [Intel processor] 1 vCPU server offered by Microsoft Azure with 1 vCPUs, 1 GiB of memory and 4 GB of storage. The pricing starts at 0.0104 USD per hour.
1 vCPU
1 GiB Memory
4 GB Storage
Spare SCore
1,336
(All-cores)
1,336
(Single-core)

Specifications

Server Metadata

Vendor ID
azure
Server ID
Standard_B1s
Name
B1s
API Reference
Standard_B1s
Description
BS family [Premium Storage capable] [Intel processor] 1 vCPU
Family
BS
Hw Virt
Average Time To Start
26
Status
planned-for-retirement
Observed At
2026-10-25T20:56:04.352996

Availability

REGION / IDSPOTONDEMAND
East US (US) / eastus
- 0.0104 USD/h
East US 2 (US) / eastus2
- 0.0104 USD/h
North Central US (US) / northcentralus
- 0.0104 USD/h
West US 2 (US) / westus2
- 0.0104 USD/h
West US 3 (US) / westus3
- 0.0104 USD/h
Sweden Central (SE) / swedencentral
- 0.0108 USD/h
Central India (IN) / centralindia
- 0.0112 USD/h
Jio India Central (IN) / jioindiacentral
- 0.0112 USD/h
Jio India West (IN) / jioindiawest
- 0.0112 USD/h
North Europe (IE) / northeurope
- 0.0113 USD/h
Mexico Central (ZA) / mexicocentral
- 0.0114 USD/h
Spain Central (ES) / spaincentral
- 0.0114 USD/h
Canada Central (CA) / canadacentral
- 0.0116 USD/h
Canada East (CA) / canadaeast
- 0.0116 USD/h
France Central (FR) / francecentral
- 0.0118 USD/h
UK South (GB) / uksouth
- 0.0118 USD/h
UK West (GB) / ukwest
- 0.0118 USD/h
Indonesia Central (ID) / indonesiacentral
- 0.0119 USD/h
Malaysia West (MY) / malaysiawest
- 0.0119 USD/h
Austria East (AT) / austriaeast
- 0.012 USD/h
Belgium Central (BE) / belgiumcentral
- 0.012 USD/h
Germany West Central (DE) / germanywestcentral
- 0.012 USD/h
Israel Central (IL) / israelcentral
- 0.012 USD/h
Italy North (IT) / italynorth
- 0.012 USD/h
Poland Central (PL) / polandcentral
- 0.012 USD/h
West Europe (NL) / westeurope
- 0.012 USD/h
West US (US) / westus
- 0.0124 USD/h
Central US (US) / centralus
- 0.0125 USD/h
Qatar Central (QA) / qatarcentral
- 0.0125 USD/h
South Central US (US) / southcentralus
- 0.0125 USD/h
UAE North (AE) / uaenorth
- 0.0125 USD/h
West Central US (US) / westcentralus
- 0.0125 USD/h
Korea Central (KR) / koreacentral
- 0.013 USD/h
Korea South (KR) / koreasouth
- 0.013 USD/h
Australia Central (AU) / australiacentral
- 0.0132 USD/h
Australia Central 2 (AU) / australiacentral2
- 0.0132 USD/h
Australia East (AU) / australiaeast
- 0.0132 USD/h
Australia Southeast (AU) / australiasoutheast
- 0.0132 USD/h
Norway East (NO) / norwayeast
- 0.0132 USD/h
Southeast Asia (SG) / southeastasia
- 0.0132 USD/h
Switzerland North (CH) / switzerlandnorth
- 0.0132 USD/h
Japan East (JP) / japaneast
- 0.0136 USD/h
South Africa North (ZA) / southafricanorth
- 0.0136 USD/h
New Zealand North (NZ) / newzealandnorth
- 0.0139 USD/h
South India (IN) / southindia
- 0.0145 USD/h
Chile Central (CL) / chilecentral
- 0.0146 USD/h
East Asia (HK) / eastasia
- 0.0146 USD/h
West India (IN) / westindia
- 0.0147 USD/h
Japan West (JP) / japanwest
- 0.015 USD/h
Germany North (DE) / germanynorth
- 0.0156 USD/h
UAE Central (AE) / uaecentral
- 0.0156 USD/h
Brazil South (BR) / brazilsouth
- 0.0168 USD/h
France South (FR) / francesouth
- 0.0169 USD/h
South Africa West (ZA) / southafricawest
- 0.017 USD/h
Switzerland West (CH) / switzerlandwest
- 0.0171 USD/h
Norway West (NO) / norwaywest
- 0.0172 USD/h
Brazil Southeast (US) / brazilsoutheast
- 0.0218 USD/h

Processor

vCPUs
1
Hypervisor
Microsoft Hyper-V
CPU Allocation
Burstable
CPU Cores
1
CPU Speed
2.6 GHz
CPU Architecture
x86_64
CPU Manufacturer
Intel
CPU Family
Xeon
CPU Model
8272CL
CPU L1D Cache
32 KiB
CPU L1D Cache Total
32 KiB
CPU L1I Cache
32 KiB
CPU L1I Cache Total
32 KiB
CPU L2 Cache
256 KiB
CPU L2 Cache Total
256 KiB
CPU L3 Cache
50 MiB
CPU L3 Cache Total
50 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, ss, syscall, nx, pdpe1gb, rdtscp, lm, constant_tsc, rep_good, nopl, xtopology, cpuid, pni, pclmulqdq, ssse3, fma, cx16, pcid, sse4_1, sse4_2, movbe, popcnt, aes, xsave, avx, f16c, rdrand, hypervisor, lahf_lm, abm, 3dnowprefetch, pti, fsgsbase, bmi1, hle, avx2, smep, bmi2, erms, invpcid, rtm, avx512f, avx512dq, rdseed, adx, smap, clflushopt, avx512cd, avx512bw, avx512vl, xsaveopt, xsavec, xsaves, md_clear
Ecpus
1
Scalability
100

System Resources and Accelerators

MEMORY
Memory Amount
1 GiB
Memory Amount Actual
1 GiB
ACCELERATORS
Accelerator Count
0
Accelerator Memory Min
0 MiB
Accelerator Memory Total
0 MiB
Accelerators
    STORAGE
    Storage Size
    4 GB
    Storage Type
    ssd
    Storages
    • 4 GB ssd (temp disk)
    NETWORK
    Inbound Traffic
    0 GB/month
    Outbound Traffic
    0 GB/month
    IPv4
    0

    CPU and System Topology

    Server Description

    A low-cost, burstable single-core virtual machine with minimal memory, designed for lightweight utility tasks and basic development environments.

    Burstable & BudgetGeneral Purpose

    Microsoft Azure B1s is a burstable virtual machine from the BS family, configured with 1 vCPU, 1.0 GB of RAM, and 4 GB of local storage. Powered by an Intel Xeon 8272CL processor running at 2.6 GHz on the x86_64 architecture, this instance utilizes Microsoft Hyper-V virtualization. Benchmark results indicate low-tier performance, with stress-ng single-core and multi-core scores at 1335.88, and a Passmark CPU score of 1446.1. Memory bandwidth is constrained, reaching 10.85 GB/sec for uncached large block reads. The instance is designed for high cost efficiency in low-demand scenarios, utilizing a burstable CPU allocation model to manage brief performance spikes. Due to its limited memory and compute capacity, the B1s is best suited for lightweight workloads such as static web serving, basic software testing, and low-traffic background tasks.

    Economics

    Average Price per Region

    Prices per Zone

    Lowest Prices

    Performance

    Workload Profiles

    0.099Score
    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.Partial coverage: missing component benchmark(s): PassMark Memory Mark (composite).
    Component Score Weight Impact Note
    Raw Reference Normalized Target Actual
    Redis RPS (pipeline=1, SET) 127,929 ops/sec 1,919,289 ops/sec 0.068 50.00% 56.00% -78.00%
    Redis RPS (pipeline=16, SET) 817,148 ops/sec 11,728,058 ops/sec 0.068 20.00% 22.00% -45.00%
    PassMark Memory Mark (composite) 0 2,416 — 10.00% 0.00% — invalid value: 0.0
    Memory bandwidth (read, 16 MB ~ L3) 23,084 MB/sec 108,466 MB/sec 0.21 10.00% 11.00% -16.00%
    PassMark single-thread CPU 1,622 Mops/s 2,365 Mops/s 0.67 10.00% 11.00% -4.30%

    Memory Bandwidth

    OpenSSL

    Passmark CPU Scores

    BENCHMARKSCORE
    Mark
    		 1,446
    Compression
    		 16,907
    Encryption
    		 452
    Extended Instructions
    		 1,366
    Floating Point Maths
    		 2,941
    Integer Maths
    		 3,543
    Physics
    		 197
    Prime Numbers
    		 11
    Single Threaded
    		 1,622
    String Sorting
    		 2,082

    Passmark Memory Scores

    BENCHMARKSCORE
    Memory Mark
    		 0
    Database Operations
    		 0
    Memory Latency
    		 0
    Memory Read Cached
    		 0
    Memory Read Uncached
    		 0
    Memory Write
    		 0

    Stress-ng Stressors

    CPU integerSingleMultiScaling
    atomic
    		 404.91 404.91 1.00×
    bitops
    		 80,742 80,742 1.00×
    branch
    		 107,427 107,427 1.00×
    funccall
    		 352.18 352.18 1.00×
    funcret
    		 6,686 6,686 1.00×
    hash
    		 86,942 86,942 1.00×
    intmath
    		 14,130 14,130 1.00×
    nop
    		 123,223 123,223 1.00×
    prime
    		 208,083 208,083 1.00×
    rotate
    		 67,978 67,978 1.00×
    str
    		 465,200 465,200 1.00×
    wcs
    		 291,699 291,699 1.00×
    CryptographySingleMultiScaling
    crypt
    		 1,571 1,571 1.00×
    CompressionSingleMultiScaling
    jpeg
    		 348.73 348.73 1.00×
    zlib
    		 30.02 30.02 1.00×
    HypervisorSingleMultiScaling
    clock
    		 12,988 12,988 1.00×
    clone
    		 239.8 239.8 1.00×
    context
    		 1,309 1,309 1.00×
    cpu-sched
    		 60.89 60.89 1.00×
    eventfd
    		 55,974 55,974 1.00×
    fault
    		 5,404 5,404 1.00×
    fork
    		 3,134 3,134 1.00×
    getrandom
    		 30,202 30,202 1.00×
    hrtimers
    		 89,984 89,984 1.00×
    mprotect
    		 178,935 178,935 1.00×
    mtx
    		 36,468,104 36,468,104 1.00×
    munmap
    		 1,958 1,958 1.00×
    null
    		 139,774 139,774 1.00×
    pipe
    		 371,511 371,511 1.00×
    priv-instr
    		 305,932 305,932 1.00×
    resched
    		 15,142 15,142 1.00×
    switch
    		 142,430 142,430 1.00×
    timermix
    		 125,046 125,046 1.00×
    tlb-shootdown
    		 2,535 2,535 1.00×
    tsc
    		 678,543 678,543 1.00×
    usersyscall
    		 214,803 214,803 1.00×
    vdso
    		 52,381,178 52,381,178 1.00×
    vfork
    		 26,160 26,160 1.00×
    x86syscall
    		 1,580,671 1,580,671 1.00×
    yield
    		 492,957 492,957 1.00×
    zero
    		 1,041,792 1,041,792 1.00×
    CPU float/SIMDSingleMultiScaling
    eigen
    		 9,886 9,886 1.00×
    expmath
    		 1,709 1,709 1.00×
    fma
    		 416,160 416,160 1.00×
    fp
    		 82.58 82.58 1.00×
    fractal
    		 3.4 3.4 1.00×
    hyperbolic
    		 1,950 1,950 1.00×
    logmath
    		 3,028 3,028 1.00×
    matrix
    		 2,588 2,588 1.00×
    matrix-3d
    		 474.18 474.18 1.00×
    monte-carlo
    		 74.29 74.29 1.00×
    mpfr
    		 788.52 788.52 1.00×
    powmath
    		 1,075 1,075 1.00×
    trig
    		 1,271 1,271 1.00×
    veccmp
    		 9,285 9,285 1.00×
    vecfp
    		 580.28 580.28 1.00×
    vecmath
    		 1,465 1,465 1.00×
    vecshuf
    		 365.27 365.27 1.00×
    vecwide
    		 16,562 16,562 1.00×
    AlgorithmsSingleMultiScaling
    bitonicsort
    		 4.6 4.6 1.00×
    bsearch
    		 156.38 156.38 1.00×
    bubblesort
    		 0.4 0.4 1.00×
    fibsearch
    		 183.64 183.64 1.00×
    heapsort
    		 5.4 5.4 1.00×
    hsearch
    		 2,977 2,977 1.00×
    insertionsort
    		 5.4 5.4 1.00×
    malloc
    		 61,438 61,438 1.00×
    mcontend
    		 216.05 216.05 1.00×
    mergesort
    		 17.2 17.2 1.00×
    qsort
    		 11.8 11.8 1.00×
    skiplist
    		 3,948 3,948 1.00×
    tree
    		 0.8 0.8 1.00×
    MemorySingleMultiScaling
    cache
    		 150,284 150,284 1.00×
    cachehammer
    		 382,377 382,377 1.00×
    cacheline
    		 11.6 11.6 1.00×
    l1cache
    		 125.84 125.84 1.00×
    memcpy
    		 290.07 290.07 1.00×
    memrate
    		 0.77 0.77 1.00×
    memthrash
    		 39.57 39.57 1.00×
    ptr-chase
    		 10,521,123 10,521,123 1.00×
    spinmem
    		 0.4 0.4 1.00×
    stream
    		 22.25 22.25 1.00×
    vm
    		 29,599 29,599 1.00×

    Static Web Server

    Redis

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    B1s FAQs