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| -rw-r--r-- | challenge-110/james-smith/README.md | 3 |
1 files changed, 3 insertions, 0 deletions
diff --git a/challenge-110/james-smith/README.md b/challenge-110/james-smith/README.md index 014a7cd5d7..8e08f1b553 100644 --- a/challenge-110/james-smith/README.md +++ b/challenge-110/james-smith/README.md @@ -229,10 +229,13 @@ sub transpose_seek { * We then use the regex trick to get the first column of the data. * Memory usage: + * This script does not load the file all in one go - so really needs a lot less memory (vs more disc accesses). It is linear in the number of lines, e.g. for the 1000 line file we load in roughly 1Mb of data at a time, and the memory usage is roughly 1.3Mb. * Note this is `O(n)` as well as if the rows get longer then the number of bytes used does not increase. + * Having played a bit - the sweet spot of `$BYTES` lies somewhere between 1K and 2K. Smaller makes the + regex in the split more efficient, larger reduces the file IO overhead. ### Some information about speed/memory etc... |