update counts with max 1

Author: wardpeet

packages/gatsby-plugin-manifest/src/gatsby-node.js

@@ -1,18 +1,16 @@
 import * as fs from "fs"
 import * as path from "path"
 import sharp from "./safe-sharp"
-import { createContentDigest, cpuCoreCount, slash } from "gatsby-core-utils"
+import { createContentDigest, slash } from "gatsby-core-utils"
 import { defaultIcons, addDigestToPath, favicons } from "./common"
 import { doesIconExist } from "./node-helpers"
 
 import pluginOptionsSchema from "./pluginOptionsSchema"
 
 sharp.simd(true)
 
-// Handle Sharp's concurrency based on the Gatsby CPU count
-// See: http://sharp.pixelplumbing.com/en/stable/api-utility/#concurrency
-// See: https://www.gatsbyjs.org/docs/multi-core-builds/
-sharp.concurrency(cpuCoreCount() - 1)
+// force it to be 1 as we only resize one image
+sharp.concurrency(1)
 
 async function generateIcon(icon, srcIcon) {
   const imgPath = path.join(`public`, icon.src)

packages/gatsby-plugin-sharp/src/gatsby-worker.js

@@ -32,7 +32,7 @@ const q = queue(
         args.pluginOptions
       )
     ),
-  cpuCoreCount() - 1
+  Math.max(1, cpuCoreCount() - 1)
 )
 
 /**

packages/gatsby/src/utils/webpack-utils.ts

@@ -660,7 +660,7 @@ export const createWebpackUtils = (
         },
         ...terserOptions,
       },
-      parallel: cpuCoreCount() - 1,
+      parallel: Math.max(1, cpuCoreCount() - 1),
       ...options,
     })
 
@@ -731,7 +731,7 @@ export const createWebpackUtils = (
     }
   ): CssMinimizerPlugin =>
     new CssMinimizerPlugin({
-      parallel: cpuCoreCount() - 1,
+      parallel: Math.max(1, cpuCoreCount() - 1),
       ...options,
     })
 

packages/gatsby/src/utils/worker/pool.ts

@@ -3,7 +3,7 @@ import { cpuCoreCount } from "gatsby-core-utils"
 
 export const create = (): Worker =>
   new Worker(require.resolve(`./child`), {
-    numWorkers: cpuCoreCount() - 1,
+    numWorkers: Math.max(1, cpuCoreCount() - 1),
     forkOptions: {
       silent: false,
     },