Speedscope is an excellent profile viewer. Maybe you're recorded a profile with py-spy and you want to show it to other people in a GitHub issue. The speedscope app can render profiles from a URL, but where do you store the profile?
You can do this easily with gists, githack, and a little script:
The libdispatch is one of the most misused API due to the way it was presented to us when it was introduced and for many years after that, and due to the confusing documentation and API. This page is a compilation of important things to know if you're going to use this library. Many references are available at the end of this document pointing to comments from Apple's very own libdispatch maintainer (Pierre Habouzit).
My take-aways are:
You should create very few, long-lived, well-defined queues. These queues should be seen as execution contexts in your program (gui, background work, ...) that benefit from executing in parallel. An important thing to note is that if these queues are all active at once, you will get as many threads running. In most apps, you probably do not need to create more than 3 or 4 queues.
Go serial first, and as you find performance bottle necks, measure why, and if concurrency helps, apply with care, always validating under system pressure. Reuse
| // Convert Excel dates into JS date objects | |
| // | |
| // @param excelDate {Number} | |
| // @return {Date} | |
| function getJsDateFromExcel(excelDate) { | |
| // JavaScript dates can be constructed by passing milliseconds | |
| // since the Unix epoch (January 1, 1970) example: new Date(12312512312); |
