![]() Old dynos are still running but won’t appear in heroku ps. The output of heroku ps will immediately show the state (for example, starting or up) of the new dynos. Logs will show new dynos starting soon after the slug compile is finished.Once preboot is enabled, you can create new releases (by deploying code or changing a config var) as usual, but you’ll see different behavior: ![]() preboot Provide seamless web dyno deploys To check if preboot is enabled: $ heroku features -a I won’t dispute it.Enabling and disabling preboot on your application will not trigger a restart. I’ll leave it to the Heroku proponents come in with the numbers on how much faster the buildpack+slug system is. To me, the persistent filesystem is Glitch’s killer feature. However, that’s only supported up to Node.js 12, and I see lots of people needing to use newer versions of Node due to the libraries they use needing a more recent version, and I see lots of weird issues where the advice from the forum has been “run enable-npm.” And even with the custom pnpm, it’s still a nonzero amount of time to set up the dependencies. Glitch has a custom pnpm setup that’s supposedly faster than plain npm, by delivering the dependencies from the same datacenter and caching compiled native libraries. As prominently mentioned, having all the dependencies stored as part of the project saves startup time.But we do hear about people’s projects breaking when they haven’t changed anything themselves. Not sure if this actually happens, due to there being a package-lock.json or shrinkwrap.yaml. Or the same could make your project break when a library releases incompatible changes. Glitch can theoretically install newer patched versions of dependencies without you having to publish a new version.(This also leads to a sensible way for Heroku to scale apps to multiple app instances.) If you want persistent or shared state, you use a database. You shouldn’t store things in the filesystem that are meant to be seen from a later request. It’ll start out with a fresh state created from the slug every time. The project filesystem on Heroku is ephemeral. ![]() Ī few things I’ll call out that result from this: You can imagine how much time it would save to have this, as compared to Glitch, where the system installs dependencies each time it needs to start your project in a new container-devDependencies included. For Node.js apps, this involves getting the right version of node and downloading and building the dependencies. Heroku uses a “buildpack” system that compiles an app into a “slug,” which is like a big file archive with everything the app needs in order to start on demand. When you (and others) post things like “Node is not too fast on here” and “Fastify is probably quicker than Express” would you please back up those claims with some evidence that led you to these conclusions? That said, if someone has more questions, they can reply to me. I have written longer posts and it seems people are less likely to read them, and probably feel bogged down. Those problems lead to more of the same annoying questions in this forum and Support potentially being overwhelmed by bigger things they can’t fix right away.Īnd like I said before, I try not to overwhelm people with a lot of information. That’s why I said, “unless your app here is boosted,” etc. This can look a bit unprofessional when a project is in someone’s portfolio. On Glitch, I’ve also more frequently run into CORS issues, and faced the problem of waiting for the Node app itself to fire up via the Glitch loading screen. There have actually been times (and yes, it does depend on the app) where Glitch loaded my data a bit faster than Heroku, but this has varied. They’re also backed by Salesforce (for better or worse, haha). In light of giving your question more thought rather than considering how it personally affects me, I do not think Heroku is a better “value.” I said that it’s more consistent.
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