This in turn caused the CDUs to issue interrupts to the guidance computer—12,800 interrupts per second, which consumed about 15% of the computer's available compute time. As the rest of the landing tasks were consuming about 85% of the computer's time, the computer ran out of time to process all of its queued jobs in a single cycle. As scheduled jobs in the computer failed to complete in time, the programs competed for core set memory and vector accumulator registers; eventually, one and then the other were exhausted, and the LM's guidance computer began sounding program alarms and resetting.