[BUG] macOS "physicalmemory" module not working if "command" modules are set to "parallel": true

[ZandoBob]

Read the FAQ first

• I have checked the FAQ but the issue is not covered

Description

Here's my current config, it's based off the "25.jsonc" example config: config.jsonc

I wanted to display the physical memory, and the "physicalmemory" module works when called manually (fastfetch -s physicalmemory) or in the unformatted all.jsonc config (fastfetch -c all.jsonc). It wouldn't work with the config above though, and I could not figure out why. I finally figured out that it was the "command" module section that was the problem. On a whim I tried flipping "parallel" to false, and now it works. I'm not sure why this happens, and by default "parallel"is set to true, so I'm submitting this as a bug.

Version used

fastfetch 2.55.0 (aarch64)

Bug prevalence

Always

Regression

No

Installation

Package manager

Package manager

brew

Screenshots

Before:

After:

Configuration

// Based on #1576
{
    "$schema": "https://github.com/fastfetch-cli/fastfetch/raw/dev/doc/json_schema.json",
    "display": {
        "color": {
            "keys": "blue"
        },
        "separator": "",
        // Constants are reusable strings referenced by {$1}, {$2}, etc.
        // These contain ANSI escape codes for cursor positioning
        "constants": [
            "──────────────────────────────────────────────", // {$1} - horizontal line for borders
            "\u001b[47D",                                     // {$2} - move cursor left 47 columns
            "\u001b[47C",                                     // {$3} - move cursor right 47 columns
            "\u001b[46C"                                      // {$4} - move cursor right 46 columns
        ],
        "brightColor": false
    },
    "modules": [
        {
            "type": "version",
            "key": "┌───────────────┬─{$1}┐\u001b[41D",
            "format": "\u001b[1m{#keys} {1} - {2} "
        },
        {
            "type": "os",
            // Key format breakdown for OS module:
            // "│  {icon}  \u001b[s{sysname}\u001b[u\u001b[10C│{$3}│{$2}"
            //
            // │                    - Left border of key block
            //   {icon}             - OS icon (defined internally by fastfetch)
            //   \u001b[s           - ANSI escape: save cursor position (ESC[s)
            // {sysname}            - Format variable: system name (e.g., "Linux", "Darwin")
            // \u001b[u             - ANSI escape: restore cursor to saved position (ESC[u)
            //                        Necessary because the length of `{sysname}` differs between different platforms
            // \u001b[10C           - ANSI escape: move cursor right 10 columns (ESC[10C)
            // │                    - Right border of key block (always 10 columns from left border)
            // {$3}                 - Reference to constants[2]: move cursor right 47 columns
            // │                    - Right border of value block
            // {$2}                 - Reference to constants[1]: move cursor left 47 columns
            //
            // This creates a fixed-width layout where the key block is exactly 10 columns wide,
            // regardless of the actual content length. The cursor manipulation ensures proper
            // alignment for the table-like structure.
            "key": "│  {icon}  \u001b[s{sysname}\u001b[u\u001b[4C│{$3}│{$2}"
        },
        {
            "type": "datetime",
            "key": "│  {icon}  Fetched   │{$3}│{$2}",
            "format": "{year}-{month-pretty}-{day-pretty} {hour-pretty}:{minute-pretty}:{second-pretty} {timezone-name}"
        },
        // Hardware section with cyan color theme
        {
            "type": "custom",
            "key": "│{#cyan}┌──────────────┬{$1}┐{#keys}│\u001b[37D",
            "format": "{#bright_cyan} Hardware "
        },
        {
            "type": "host",
            // Similar structure but with cyan color formatting:
            // │{#cyan}│             - Left border with cyan color
            //  {icon}               - Chassis icon
            //  Chassis             - Fixed label text
            // │{$4}│{#keys}│{$2}    - Positioning and borders for value area
            "key": "│{#cyan}│ {icon}  Chassis   │{$4}│{#keys}│{$2}"
        },
        {
            "type": "physicalmemory",
            "key": "│{#cyan}│ {icon}  RAM       │{$4}│{#keys}│{$2}",
            "format": "{size}"
        },
        {
            "type": "swap",
            "key": "│{#cyan}│ {icon}  SWAP      │{$4}│{#keys}│{$2}"
        },
        {
            "type": "cpu",
            "key": "│{#cyan}│ {icon}  CPU       │{$4}│{#keys}│{$2}",
            "showPeCoreCount": true
        },
        {
            "type": "gpu",
            "key": "│{#cyan}│ {icon}  GPU       │{$4}│{#keys}│{$2}"
        },
        {
            "type": "disk",
            "key": "│{#cyan}│ {icon}  Disk      │{$4}│{#keys}│{$2}",
            "format": "{size-used} \/ {size-total} ({size-percentage}) - {filesystem}",
        },
        {
            "type": "battery",
            "key": "│{#cyan}│ {icon}  Battery   │{$4}│{#keys}│{$2}"
        },
        {
            "type": "custom",
            "key": "│{#cyan}└──────────────┴{$1}┘{#keys}│",
            "format": ""
        },

        // Desktop section with green color theme
        {
            "type": "custom",
            "key": "│{#green}┌──────────────┬{$1}┐{#keys}│\u001b[37D",
            "format": "{#bright_green} Desktop "
        },
        {
            "type": "de",
            "key": "│{#green}│ {icon}  Desktop   │{$4}│{#keys}│{$2}"
        },
        {
            "type": "wm",
            "key": "│{#green}│ {icon}  Session   │{$4}│{#keys}│{$2}"
        },
        {
            "type": "display",
            "key": "│{#green}│ {icon}  Display   │{$4}│{#keys}│{$2}",
            "compactType": "original-with-refresh-rate"
        },
        {
            "type": "gpu",
            "key": "│{#green}│ {icon}  G-Driver  │{$4}│{#keys}│{$2}",
            "format": "{driver}"
        },
        {
            "type": "custom",
            "key": "│{#green}└──────────────┴{$1}┘{#keys}│",
            "format": ""
        },

        // Terminal section with yellow color theme
        {
            "type": "custom",
            "key": "│{#yellow}┌──────────────┬{$1}┐{#keys}│\u001b[37D",
            "format": "{#bright_yellow} Terminal "
        },
        {
            "type": "shell",
            "key": "│{#yellow}│ {icon}  Shell     │{$4}│{#keys}│{$2}"
        },
        {
            "type": "terminal",
            "key": "│{#yellow}│ {icon}  Terminal  │{$4}│{#keys}│{$2}"
        },
        {
            "type": "terminalfont",
            "key": "│{#yellow}│ {icon}  Term Font │{$4}│{#keys}│{$2}"
        },
        {
            "type": "terminaltheme",
            "key": "│{#yellow}│ {icon}  Colors    │{$4}│{#keys}│{$2}"
        },
        {
            "type": "packages",
            "key": "│{#yellow}│ {icon}  Packages  │{$4}│{#keys}│{$2}"
        },
        {
            "type": "custom",
            "key": "│{#yellow}└──────────────┴{$1}┘{#keys}│",
            "format": ""
        },

        // Development section with red color theme
        {
            "type": "custom",
            "key": "│{#red}┌──────────────┬{$1}┐{#keys}│\u001b[39D",
            "format": "{#bright_red} Development "
        },
        {
            "type": "command",
            "keyIcon": "",                                   // Custom icon override
            "key": "│{#red}│ {icon}  Rust      │{$4}│{#keys}│{$2}",
            "text": "rustc --version",
            "format": "rustc {~6,13}",                        // Print 6th to 13th characters (version number)
            "parallel": false                                  // Enable parallel execution for performance
        },
        {
            "type": "command",
            "condition": {
                "!system": "Windows"                          // Posix version
            },
            "keyIcon": "",
            "key": "│{#red}│ {icon}  Clang     │{$4}│{#keys}│{$2}",
            "text": "clang --version | head -1 | awk '{print $NF}'",
            "format": "clang {}"
        },
        {
            "type": "command",
            "condition": {
                "system": "Windows"                           // Windows version
            },
            "keyIcon": "",
            "key": "│{#red}│ {icon}  Clang     │{$4}│{#keys}│{$2}",
            "text": "clang --version | findstr version",      // Finds the line with "version"
            "format": "clang {~-6}",                          // Prints the last 6 characters (version number)
            "parallel": false
        },
        {
            "type": "command",
            "keyIcon": "",
            "key": "│{#red}│ {icon}  NodeJS    │{$4}│{#keys}│{$2}",
            "text": "node --version",
            "format": "node {~1}",                            // {~1} removes first character (v)
            "parallel": false
        },
        {
            "type": "command",
            "keyIcon": "",
            "key": "│{#red}│ {icon}  Go        │{$4}│{#keys}│{$2}",
            "text": "go version | cut -d' ' -f3",
            "format": "go {~2}",                              // {~2} removes first 2 characters (go)
            "parallel": false
        },
        {
            "type": "command",
            "keyIcon": "",
            "key": "│{#red}│ {icon}  Zig       │{$4}│{#keys}│{$2}",
            "text": "zig version",
            "format": "zig {}",
            "parallel": false
        },
        {
            "type": "editor",
            "key": "│{#red}│ {icon}  Editor    │{$4}│{#keys}│{$2}"
        },
        {
            "type": "command",
            "keyIcon": "󰊢",
            "key": "│{#red}│ {icon}  Git       │{$4}│{#keys}│{$2}",
            "text": "git version",
            "format": "git {~12}",
            "parallel": false
        },
        {
            "type": "custom",
            "key": "│{#red}└──────────────┴{$1}┘{#keys}│",
            "format": ""
        },

        // Uptime section with magenta color theme
        {
            "type": "custom",
            "key": "│{#magenta}┌──────────────┬{$1}┐{#keys}│\u001b[36D",
            "format": "{#bright_magenta} Uptime "
        },
        {
            "type": "uptime",
            "key": "│{#magenta}│ {icon}  Uptime    │{$4}│{#keys}│{$2}"
        },
        {
            "type": "users",
            "myselfOnly": true,                               // Only show current user
            "keyIcon": "",
            "key": "│{#magenta}│ {icon}  Login     │{$4}│{#keys}│{$2}"
        },
        {
            "condition": {                                    // Conditional module: only show on non-macOS
                "!system": "macOS"
            },
            "type": "disk",
            "keyIcon": "",
            "key": "│{#magenta}│ {icon}  OS Age    │{$4}│{#keys}│{$2}",
            "folders": "/",                                   // Check root filesystem
            "format": "{create-time:10} [{days} days]"        // Show creation time and age in days
        },
        {
            "condition": {                                    // Conditional module: only show on macOS
                "system": "macOS"
            },
            "type": "disk",
            "keyIcon": "",
            "key": "│{#magenta}│ {icon}  OS Age    │{$4}│{#keys}│{$2}",
            "folders": "/System/Volumes/VM",                 // Work around for APFS on macOS
            "format": "{create-time:10} [{days} days]"
        },
        {
            "type": "custom",
            "key": "│{#magenta}└──────────────┴{$1}┘{#keys}│",
            "format": ""
        },
        {
            "type": "custom",
            "key": "└─────────────────{$1}┘",                // Bottom border of the entire layout
            "format": ""
        },

        // End with color palette and line break
        "break",                                             // Add a blank line
        "colors"                                             // Display color palette
    ]
}

/*
Key Format Structure Explanation:

The key format uses a combination of:
1. Unicode box drawing characters (│ ┌ ┐ └ ┘ ┬ ┴) for borders
2. ANSI escape codes for cursor positioning (\u001b[...)
3. Format variables ({icon}, {sysname}, etc.)
4. Constant references ({$1}, {$2}, etc.)
5. Color formatting ({#color})

ANSI Escape Codes Used:
- \u001b[s      - Save cursor position (ESC[s)
- \u001b[u      - Restore cursor position (ESC[u)
- \u001b[nC     - Move cursor right n columns (ESC[nC)
- \u001b[nD     - Move cursor left n columns (ESC[nD)

This creates a table-like layout with fixed column widths and proper alignment,
regardless of the actual content length in each field.

For more ANSI escape code reference, see:
https://gist.github.com/fnky/458719343aabd01cfb17a3a4f7296797#cursor-controls
*/

System information

[
  {
    "type": "Title",
    "result": {
      "userName": "josie",
      "fullUserName": "josie",
      "hostName": "mbadream.local",
      "homeDir": "/Users/josie/",
      "exePath": "/opt/homebrew/Cellar/fastfetch/2.55.0/bin/fastfetch",
      "userShell": "/opt/homebrew/bin/fish"
    },
    "stat": 0.012000083923339844
  },
  {
    "type": "Separator",
    "error": "Unsupported for JSON format",
    "stat": 0.004999995231628418
  },
  {
    "type": "OS",
    "result": {
      "buildID": "25B78",
      "codename": "Tahoe",
      "id": "macos",
      "idLike": "",
      "name": "macOS",
      "prettyName": "macOS Tahoe 26.1 (25B78)",
      "variant": "",
      "variantID": "",
      "version": "26.1",
      "versionID": "26.1"
    },
    "stat": 0.5149999856948853
  },
  {
    "type": "Host",
    "result": {
      "family": "Mac16,12",
      "name": "MacBook Air (13-inch, M4, 2025)",
      "version": "",
      "sku": "",
      "vendor": "Apple Inc.",
      "serial": "FVTXTKP9HP",
      "uuid": "07064E97-2114-5A6F-BA39-93D4A8A5E7CB"
    },
    "stat": 0.19099998474121094
  },
  {
    "type": "BIOS",
    "result": {
      "date": "Fri Oct 10 22:31:40 PDT 2025",
      "release": "",
      "vendor": "Apple Inc.",
      "version": "13822.41.1",
      "type": "iBoot"
    },
    "stat": 0.2330000400543213
  },
  {
    "type": "Bootmgr",
    "result": {
      "name": "iBoot",
      "firmware": "/System/Library/CoreServices/boot.efi",
      "order": 0,
      "secureBoot": false
    },
    "stat": 0.02199995517730713
  },
  {
    "type": "Board",
    "result": {
      "name": "J713AP",
      "vendor": "Apple Inc.",
      "version": "",
      "serial": ""
    },
    "stat": 0.04400002956390381
  },
  {
    "type": "Chassis",
    "result": {
      "type": "Laptop",
      "vendor": "Apple Inc.",
      "version": "",
      "serial": ""
    },
    "stat": 0.08000004291534424
  },
  {
    "type": "Kernel",
    "result": {
      "architecture": "arm64",
      "name": "Darwin",
      "release": "25.1.0",
      "version": "Darwin Kernel Version 25.1.0: Mon Oct 20 19:32:56 PDT 2025; root:xnu-12377.41.6~2/RELEASE_ARM64_T8132",
      "pageSize": 16384
    },
    "stat": 0.006000041961669922
  },
  {
    "type": "InitSystem",
    "result": {
      "name": "launchd",
      "exe": "/sbin/launchd",
      "version": "7.0.0",
      "pid": 1
    },
    "stat": 9.026999950408936
  },
  {
    "type": "Uptime",
    "result": {
      "uptime": 1011632360,
      "bootTime": "2025-11-03T20:07:16.744-0600"
    },
    "stat": 0.5069999694824219
  },
  {
    "type": "Loadavg",
    "result": [
      1.54541015625,
      1.4970703125,
      1.544921875
    ],
    "stat": 0.004999995231628418
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  {
    "type": "Processes",
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    "stat": 0.2710000276565552
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      "amSystem": 0,
      "amUser": 0,
      "apk": 0,
      "brew": 114,
      "brewCask": 3,
      "choco": 0,
      "dpkg": 0,
      "emerge": 0,
      "eopkg": 0,
      "flatpakSystem": 0,
      "flatpakUser": 0,
      "guixSystem": 0,
      "guixUser": 0,
      "guixHome": 0,
      "hpkgSystem": 0,
      "hpkgUser": 0,
      "linglong": 0,
      "mport": 0,
      "nixDefault": 0,
      "nixSystem": 0,
      "nixUser": 0,
      "opkg": 0,
      "pacman": 0,
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      "paludis": 0,
      "pisi": 0,
      "pkg": 0,
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      "scoopGlobal": 0,
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      "pacmanBranch": ""
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  {
    "type": "Shell",
    "result": {
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      "exeName": "fish",
      "exePath": "/opt/homebrew/bin/fish",
      "pid": 31102,
      "ppid": 31101,
      "processName": "fish",
      "prettyName": "fish",
      "version": "4.2.1",
      "tty": 0
    },
    "stat": 6.536999940872192
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  {
    "type": "Editor",
    "error": "$VISUAL or $EDITOR not set",
    "stat": 0.006000041961669922
  },
  {
    "type": "Display",
    "result": [
      {
        "id": 1,
        "name": "Color LCD",
        "primary": true,
        "output": {
          "width": 2940,
          "height": 1912,
          "refreshRate": 60.0,
          "drrStatus": null
        },
        "scaled": {
          "width": 1470,
          "height": 956
        },
        "preferred": {
          "width": 2560,
          "height": 1664,
          "refreshRate": 60.0
        },
        "physical": {
          "width": 290,
          "height": 189
        },
        "rotation": 0,
        "bitDepth": 10,
        "hdrStatus": "Unsupported",
        "type": "Builtin",
        "manufactureDate": null,
        "serial": 4251086178,
        "platformApi": "CoreGraphics"
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    "stat": 23.056999921798706
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  {
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        "name": "Color LCD",
        "max": 1.0,
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        "builtin": true
      }
    ],
    "stat": 0.7960000038146973
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  {
    "type": "Monitor",
    "error": "Monitor module is an alias of Display module",
    "stat": 0.001999974250793457
  },
  {
    "type": "LM",
    "error": "Not supported on this platform",
    "stat": 0.0
  },
  {
    "type": "DE",
    "error": "No DE found",
    "stat": 0.007000088691711426
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  {
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      "pluginName": "",
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  {
    "type": "WMTheme",
    "result": "Multicolor (Light)",
    "stat": 0.11300003528594971
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  {
    "type": "Theme",
    "result": {
      "theme1": "Liquid Glass",
      "theme2": ""
    },
    "stat": 0.004999995231628418
  },
  {
    "type": "Icons",
    "error": "Not supported on this platform",
    "stat": 0.001000046730041504
  },
  {
    "type": "Font",
    "result": {
      "display": ".AppleSystemUIFont [System], Helvetica [User]",
      "fonts": [
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        "Menlo"
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    "stat": 3.4269999265670776
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  {
    "type": "Cursor",
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      "theme": "Fill - Black, Outline - White",
      "size": "32"
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    "stat": 0.10399997234344482
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  {
    "type": "Wallpaper",
    "result": "Built-in image wallpaper",
    "stat": 0.19700002670288086
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  {
    "type": "Terminal",
    "result": {
      "processName": "Apple_Terminal",
      "exe": "/System/Applications/Utilities/Terminal.app/Contents/MacOS/Terminal",
      "exeName": "Terminal",
      "exePath": "/System/Applications/Utilities/Terminal.app/Contents/MacOS/Terminal",
      "pid": 1360,
      "ppid": 1,
      "prettyName": "Apple Terminal",
      "version": "465",
      "tty": "/dev/ttys000"
    },
    "stat": 1.496000051498413
  },
  {
    "type": "TerminalFont",
    "result": {
      "font": {
        "name": "SFMonoTerminal-Regular",
        "size": "12",
        "styles": [],
        "pretty": "SFMonoTerminal-Regular (12pt)"
      },
      "fallback": {
        "name": "",
        "size": "",
        "styles": [],
        "pretty": ""
      }
    },
    "stat": 63.871999979019165
  },
  {
    "type": "TerminalSize",
    "result": {
      "columns": 120,
      "rows": 30,
      "width": 840,
      "height": 450
    },
    "stat": 0.006000041961669922
  },
  {
    "type": "TerminalTheme",
    "result": {
      "fg": {
        "r": 230,
        "g": 230,
        "b": 230,
        "dark": false
      },
      "bg": {
        "r": 33,
        "g": 39,
        "b": 51,
        "dark": true
      }
    },
    "stat": 0.15999996662139893
  },
  {
    "type": "CPU",
    "result": {
      "cpu": "Apple M4",
      "vendor": "Apple",
      "packages": 1,
      "cores": {
        "physical": 10,
        "logical": 10,
        "online": 10
      },
      "frequency": {
        "base": 0,
        "max": 4464
      },
      "coreTypes": [
        {
          "count": 4,
          "freq": 2
        },
        {
          "count": 6,
          "freq": 1
        }
      ],
      "temperature": 48.17680803934733,
      "march": "ARMv9.3-A"
    },
    "stat": 3.7380000352859497
  },
  {
    "type": "CPUCache",
    "result": {
      "l1": [
        {
          "size": 196608,
          "num": 4,
          "lineSize": 0,
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Features built-in

threads
vulkan
imagemagick7
chafa
zlib
sqlite3
System yyjson

[CarterLi]

Should be dup of #2056