HN Hall of Fame Weekly email

Does my data fit in RAM?

yourdatafitsinram.net Tools, games & demos Interactive tools & demos Software engineering Candidate
Screenshot of yourdatafitsinram.net captured 2026-07-20
Page preview · captured 2026-07-20

Resurfaced independently across 4 calendar years, with breakout response in 2 of them.

submissions
4
submitters
3
observed span
2020–2024
peak thread · 162 comments
216 pts
latest 20+ return · 2022-08-02
150 pts

Submission timeline

2007–2026

One slot for every year since HN launched. Height is that year's peak points; orange marks a 100+ point or 50+ comment breakout. Select a bar to open its strongest thread.

First comments on top threads

HN comment order

Some pedantry... Raw RAM space is not the issue... it's indexing and structure of the data that makes it process-able. If you just need to spin through the data once, there's no need to even put all of it in RAM - just stream it off disk and process it sequentially. If you need to join the data, filter, index, query it, you'll need a lot more RAM than your actual data. Database engines have their own overhead (system tables…

Jupe·216-point thread·

There's just a huge amount of waste in many cases which is very easy to fix. For example, if we have a list of fractions (0.0-1.0): * Python list of N Python floats: 32×N bytes (approximate, the Python float is 24 bytes + 8-byte pointer for each item in the list) * NumPy array of N double floats: 8×N bytes * Hey, we don't need that much precision, let's use 32-bit floats in NumPy: 4×N * Actually, values of 0-100…

The first top-level comment from each of the four biggest threads, in HN’s own order. Excerpts are shortened; open a comment for full context.

Breakout years
2

100+ points or 50+ comments

Total points
370

reference only — not used in Hall rules or ranking

Total comments
303

reference only — not used in Hall rules or ranking

Every submission

DateTitle as submittedByPointsComments
2020-02-12Does my data fit in RAM?First breakout · Best threadlouwrentius216162
2022-08-02Does my data fit in RAM?Latest 20+ point returnlouwrentius150141
2023-11-05Does your data fit in RAM?capableweb20
2024-06-20Does your data fit in RAM?mulmen20