Java OSGi workload

This section presents the performance figures that were obtained by running the Java OSGi workload.

The Java OSGi workload is composed of several applications, as described in Java OSGi workload.

The hardware used for the benchmarks is described in Workload environment. The measurement LPAR was configured with three GCPs and one zIIP, which resulted in an LSPR equivalent processor of 2964-704.

CICS® TS 5.3 and CICS TS 5.4 were compared by using the software levels as described in Workload environment. Both configurations used a single CICS region and the following additional software levels and configuration options:

  • Db2® V12
  • Java 8 SR4 (64-bit)
  • Single JVMSERVER resource with THREADLIMIT=25

Both JVM servers used the following JVM options:

  • -Xgcpolicy:gencon
  • -Xcompressedrefs
  • -XXnosuballoc32bitmem
  • -Xmx100M
  • -Xms100M
  • -Xmnx70M
  • -Xmns70M
  • -Xmox30M
  • -Xmos30M

As described in Repeatable measurements, this workload requires a warm-up period of 20 minutes. After this warm-up phase completed, the request injection rate was increased every 5 minutes. CPU usage data was collected using IBM z/OS Resource Measurement Facility (RMF). An average CPU per request value was calculated using the last minute of each 5-minute interval.

Table 1 lists the performance results of the Java OSGi workload that used CICS TS 5.3.

Table 1. CICS TS 5.3 performance results for OSGi workload
ETR CICS CPU not zIIP-eligible CICS CPU zIIP-eligible CICS CPU total
233.98 22.27% 74.51% 96.78%
467.93 43.26% 148.27% 191.53%
780.13 78.72% 249.64% 328.36%

The performance results for CICS TS 5.4 are shown in Table 2.

Table 2. CICS TS 5.4 performance results for OSGi workload
ETR CICS CPU not zIIP-eligible CICS CPU zIIP-eligible CICS CPU total
233.98 22.68% 72.18% 94.86%
467.97 44.32% 144.65% 188.97%
779.38 81.19% 242.10% 323.29%

The CICS CPU total values from Table 1 and Table 2 are plotted in Figure 1.

Figure 1. Comparing overall CPU utilization for Java OSGi workload with CICS TS 5.3 and CICS TS 5.4
The blue line indicates the CICS TS 5.3 plot, while the red line indicates the CICS TS 5.4 plot.

The offload eligibility figures are presented as a chart in Figure 2.

Figure 2. Comparing offload-eligible CPU utilization for OSGi workload with CICS TS 5.3 and CICS TS 5.4
The blue line indicates the zIIP-ineligible CICS TS 5.3 plot, while the red line indicates the zIIP-ineligible CICS TS 5.4 plot. The light green line indicates the zIIP-eligible CICS TS 5.3 plot, while the purple line indicates the zIIP-eligible CICS TS 5.4 plot.

The average CPU per transaction value for this workload using the CICS TS 5.3 release is calculated to be 4.146 ms. The same value for the CICS TS 5.4 release is calculated to be 4.080 ms.

Using the methodology to calculate the zIIP eligibility of the workload described in Java servlet that uses JDBC and VSAM: CICS TS V5.4, the CICS TS 5.3 release had an average zIIP eligibility of 76.8%. The CICS TS 5.4 release had an average zIIP eligibility of 75.8%.

As observed with the Java servlet workload, the performance of Java OSGi applications is similar in CICS TS 5.4 when compared with CICS TS 5.3, both in terms of total CPU consumed and the fraction that is eligible for offload to a zIIP engine.