当Spark应用程序reduce task个数小于等于这个值时才会采用bypass机制,如果reduce task 个数大于这个值,可以设置这个参数大一些,使用bypass机制。 6.内存调节 统一内存中,降低spark.memory.fraction参数值,默认是0.6,如果Spark应用程序中对RDD的缓存要求不高,或者shuffle数据量不大,可以降低这个参数给task运行足够的内存。
Table 4, and Figure 5 show the external PLL circuitry for either x1 (PLL bypass) or x4 PLL multiply modes. Table 3 and Figure 6 show the external PLL circuitry for a system with ONLY x1 (PLL bypass) mode. To minimize the clock jitter, a single clean power supply should power both...
bypass to the PLL path); seeTable8-1andFigure8-1. Under some operating conditions, the maximum PLL lock time may vary from the specified typical value. For the PLL lock time values, seeTable8-1. Table 8-1. PLL Lock and Reset Times ...
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The device includes a programmable PLL which allows software control of PLL bypass via the PLLEN bit in the PLLCSR register. With this enhanced functionality come some additional considerations when entering power−down modes. The power−down modes (PD2 and PD3) function by disabling the PLL...
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Table3andFigure6show the external PLL circuitry for a system with ONLY x1 (PLL bypass) mode. To minimize the clock jitter, a single clean power supply should power both the ’C67x device and the external clock oscillator circuit. Noise coupling into PLLF will directly impact PLL clock jitter...