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Build by default with optimization level -O2 for GCC

2018-05-25, Andrey Skvortsov

a66062a205ae

Build by default with optimization level -O2 for GCC

before -O0 was used by default, that caused pretty bad performance.

Amd64, i6700k, 4200MHz, GNU/Linux (non-RT kernel), gcc 7.2.0

-------------------------------------
Optimization | EN/ENO |no EN/ENO |
-------------------------------------
default | 11 | 9.5 |
-O3 | 3.9 | 5.2 |
-O2 | 4 | 4.8 |
-Os | 4.1 | 3.5 |
-Ofast | 3.9 | 5.2 |
-------------------------------------

ARM, BBB Cortex-A8, 600Mhz, GNU/Linux, gcc 4.6.3

-------------------------------------
Optimization | EN/ENO |no EN/ENO |
-------------------------------------
default | 273 | 226 |
-O3 | 141.8 | 106.2 |
-O2 | 142 | 107 |
-Os | 152.5 | 112.2 |
-Ofast | 141.7 | 106.2 |
-------------------------------------

For embedded systems with size constaints (like Cortex-Mx, AVR and so
on) I usually use -Os. It gets pretty good results. For
GNU/Linux-based systems -O2 is usually a good choice, as you see the
test results.

<xsd:schema xmlns:xsd="http://www.w3.org/2001/XMLSchema">

<xsd:annotation>

<xsd:documentation xml:lang="en">

Purchase order schema for Example.com.

</xsd:documentation>

</xsd:annotation>

<xsd:element name="purchaseOrder" type="PurchaseOrderType"/>

<xsd:element name="comment" type="xsd:string"/>

<xsd:complexType name="PurchaseOrderType">

<xsd:sequence>

<xsd:element name="shipTo" type="USAddress"/>

<xsd:element name="billTo" type="USAddress"/>

<xsd:element ref="comment" minOccurs="0"/>

<xsd:element name="items" type="Items"/>

</xsd:sequence>

<xsd:attribute name="orderDate" type="xsd:date"/>

</xsd:complexType>

<xsd:complexType name="USAddress">

<xsd:sequence>

<xsd:element name="name" type="xsd:string"/>

<xsd:element name="street" type="xsd:string"/>

<xsd:element name="city" type="xsd:string"/>

<xsd:element name="state" type="xsd:string"/>

<xsd:element name="zip" type="xsd:decimal"/>

</xsd:sequence>

<xsd:attribute name="country" type="xsd:NMTOKEN"

fixed="US"/>

</xsd:complexType>

<xsd:complexType name="Items">

<xsd:sequence>

<xsd:element name="item" minOccurs="0" maxOccurs="unbounded">

<xsd:complexType>

<xsd:sequence>

<xsd:element name="productName" type="xsd:string"/>

<xsd:element name="quantity">

<xsd:simpleType>

<xsd:restriction base="xsd:positiveInteger">

<xsd:maxExclusive value="100"/>

</xsd:restriction>

</xsd:simpleType>

</xsd:element>

<xsd:element name="USPrice" type="xsd:decimal"/>

<xsd:element ref="comment" minOccurs="0"/>

<xsd:element name="shipDate" type="xsd:date" minOccurs="0"/>

</xsd:sequence>

<xsd:attribute name="partNum" type="SKU" use="required"/>

</xsd:complexType>

</xsd:element>

</xsd:sequence>

</xsd:complexType>

<xsd:simpleType name="SKU">

<xsd:restriction base="xsd:string">

<xsd:pattern value="\d{3}-[A-Z]{2}"/>

</xsd:restriction>

</xsd:simpleType>

</xsd:schema>

beremiz