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The Speed of Time

Brendan Gregg

Since instances of both CentOS and Ubuntu were running in parallel, I could collect flame graphs at the same time (same time-of-day traffic mix) and compare them side by side. As a Xen guest, this profile was gathered using perf(1) and the kernel's software cpu-clock soft interrupts, not the hardware NMI. But I'm not completely sure.

Speed 126
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The Speed of Time

Brendan Gregg

Since instances of both CentOS and Ubuntu were running in parallel, I could collect flame graphs at the same time (same time-of-day traffic mix) and compare them side by side. As a Xen guest, this profile was gathered using perf(1) and the kernel's software cpu-clock soft interrupts, not the hardware NMI.

Speed 52
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article thumbnail

The Speed of Time

Brendan Gregg

Since instances of both CentOS and Ubuntu were running in parallel, I could collect flame graphs at the same time (same time-of-day traffic mix) and compare them side by side. As a Xen guest, this profile was gathered using perf(1) and the kernel's software cpu-clock soft interrupts, not the hardware NMI. But I'm not completely sure.

Speed 40
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The Great Firewall of China: Obstacles to Monitoring Performance

Dotcom-Montior

The entire country of China’s internet connectivity is shielded by the Great Firewall (GFW). There are three state-owned ISP providers, China Unicom, China Telecom, and China Mobile , that control internet in China. The most recent technology automatically shuts internet off whenever blacklisted URLs are accessed.

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Observations on the Importance of Cloud-based Analytics

All Things Distributed

For example many of the Internet of Things innovations that we have seen come to life in the past years on AWS all have a significant analytics components to it. In the past analytics within an organization was the pinnacle of old style IT: a centralized data warehouse running on specialized hardware.

Analytics 135
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Understanding operational 5G: a first measurement study on its coverage, performance and energy consumption

The Morning Paper

We are standing on the eve of the 5G era… 5G, as a monumental shift in cellular communication technology, holds tremendous potential for spurring innovations across many vertical industries, with its promised multi-Gbps speed, sub-10 ms low latency, and massive connectivity. Throughput and latency. Some of these problems (e.g.

Energy 130
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Mobile browser testing – what is it and when is it done?

Testsigma

With the rapidly increasing use of smartphones and ease of access to the internet across the globe, testing has spread across vast platforms. For example, if you are using internet banking via a Mobile Web application, it will not allow you to save cards or mark any transaction as favourite. What are Mobile Web Applications?

Mobile 52