Xms size must be multiple of 1024

 from java (oracle.com) and java (oracle.com):

-Xmssize

Sets the minimum and the initial size (in bytes) of the heap. This value must be a multiple of 1024 and greater than 1 MB. Append the letter k or K to indicate kilobytes, m or M to indicate megabytes, g or G to indicate gigabytes.

The following examples show how to set the size of allocated memory to 6 MB using various units:

-Xms6291456
-Xms6144k
-Xms6m

Also for 

-Xmxsize

Specifies the maximum size (in bytes) of the memory allocation pool in bytes. This value must be a multiple of 1024 and greater than 2 MB. Append the letter k or K to indicate kilobytes, m or M to indicate megabytes, g or G to indicate gigabytes. The default value is chosen at runtime based on system configuration. For server deployments, -Xms and -Xmx are often set to the same value. See the section "Ergonomics" in Java SE HotSpot Virtual Machine Garbage Collection Tuning Guide at  http://docs.oracle.com/javase/8/docs/technotes/guides/vm/gctuning/index.html.

The following examples show how to set the maximum allowed size of allocated memory to 80 MB using various units:

-Xmx83886080
-Xmx81920k
-Xmx80m

The -Xmx option is equivalent to -XX:MaxHeapSize.

Compressed Windows C-drive and LTS Ubuntu

I compressed my PC's Windows 10 C drive after spending a very long time trying to figure out how to get it out of the "red". Unfortunately, the next time I started up LTS Ubuntu, it complained about the virtual disk being compressed and would not start up.

I followed other web advice to look under C:\users\[me]\AppData\Local\Packages

There I found something named CanonicalGroupLimited.Ubuntu20.04onWindows_79rblahblah ..

After I decompressed that package LTS Ubuntu worked again.

python len() for record offsets

 From a colleague:

In case you ever have to do an f.seek():

When calculating record offsets, python only does a consistent and correct len() value if your file is opened in binary.

Performance illusion from using repetitive test data

We often copy a few fake records to create a large input file with which to test how the code handles it.

It's a useful test; but don't use it to gauge performance. 

Data from repeated records can be cached and reused. If your production data will vary, then it won't get the same use out of caching. Caching could even hurt performance.