The more threads running on a given system, the more demand for those limited system resources and the more time spent waiting on synchronization locks to release.

给定系统上运行的线程越多，对那些有限系统资源的需要更多，等待同步锁释放的时间越长。

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The full IIS has an on-demand worker process model and activation system and can bring up and shutdown worker processes on demand.

完整的IIS有个按需的工作进程模型和激活系统，可以根据需要启动或是停止工作进程。

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But some companies have found a solution: instead of streaming all data, they equip planes with a system that streams on demand.

一些航空公司想出了一种解决方案：不传送所有的实时数据，而是在飞机上装上一种系统，这种系统可根据需要传送数据。

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Of course, if there were instead systems of assessments in a competency-based learning system built for students to take an assessment on-demand when they were ready to demonstrate mastery on specific competencies, we would see a different picture develop with assessments that left no doubt that they were different.

FORBES: Could Competency-Based Learning Save the Common Core?

Playcast, based in Israel and London, is a games-on-demand system for cable and IPTV operators.

FORBES: Life without a Gaming Console Brought to you by Playcast

These services could include Global Positioning System (GPS), on-demand entertainment, Internet and Web access, or weather and traffic conditions.

CNN: The story