How to allocate more memory in 11ty eleventy website

Posted on January 13, 2024

If you need to build a quite big website with 11ty eleventy builder, you might face this stack error of memory:

9:32:41 AM: <--- Last few GCs --->
9:32:41 AM: [3870:0x5de8c10]   130560 ms: Mark-sweep 2020.3 (2089.4) -> 2011.7 (2095.9) MB, 811.6 / 0.0 ms  (average mu = 0.644, current mu = 0.090) allocation failure scavenge might not succeed
9:32:41 AM: [3870:0x5de8c10]   131415 ms: Mark-sweep 2027.6 (2095.9) -> 2019.0 (2103.6) MB, 779.6 / 0.0 ms 

The solution is to allocate more memory to your node process using the --max-old-space-size flag.

So, here the steps if you're using the default command npx @11ty/eleventy:

  • Install explicitly 11ty eleventy with npm i @11ty/eleventy -D
  • Change the build command with one of the following:

In a regular repo:

node --max-old-space-size=4096 ./node_modules/@11ty/eleventy/cmd.js --quiet

In a monorepo:

node --max-old-space-size=4096 ../../node_modules/@11ty/eleventy/cmd.js --quiet

So, adapt the path to the 11ty eleventy path and also the memory number 4096 with your preference.