APT_BUFFER_FREE_RUN

APT_BUFFER_FREE_RUN specifies how much of the available in-memory buffer to consume before the buffer resists

This environment variable is available in the InfoSphere® DataStage® Administrator, under the Parallel category. It is expressed as a decimal representing the percentage of Maximum memory buffer size (for example, 0.5 is 50%). When the amount of data in the buffer is less than this value, new data is accepted automatically. When the data exceeds it, the buffer first tries to write some of the data it contains before accepting more.

The default value is 50% of the Maximum memory buffer size. You can set it to greater than 100%, in which case the buffer continues to store data up to the indicated multiple of Maximum memory buffer size before writing to disk.